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Ab Initio Study of Transition Metal Adsorption on a Borophene Nanosheet IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-12-24 Adeleh Vatankhahan; Tayebeh Movlarooy
In this letter, the effect of transition metal (TM) adsorption on the magnetic and electronic properties of borophene nanosheets is investigated. The borophene surface is modified by TMs, and its characteristics are evaluated using density functional theory. The appropriate site for TM adsorption is calculated on the middle of a hexagonal loop (H site). The binding energies between the adsorbed TMs
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Direct Observation of Large Barkhausen Jump in Thin Vicalloy Wires IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-12-23 Felix Huening; Andreas Backes
Thin Vicalloy wires with bistable magnetization states exhibit a fast magnetization reversal when excited by an external magnetic field. The reversal is accompanied by a large Barkhausen jump that is independent on the rate of change of the external field. For indirect observation of the large Barkhausen jump and for many sensor applications, a pickup coil is used in general. The amplitude of the voltage
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Modified Multitrack Joint Two-Dimensional Viterbi Detectors for Rate-4/5 and Rate-5/6 Modulation Codes in Bit-Patterned Magnetic Recording Systems IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-12-14 Chaiwat Buajong; Chanon Warisarn
For an ultrahigh areal-density bit-patterned magnetic recording, system performance is severely degraded by intertrack interference (ITI). Rate-4/5 and rate-5/6 modulation codes were introduced to avoid data patterns that can cause severe ITI. However, their decoders might not be able to correctly perform for data patterns that do not match with their look-up tables during the decoding process. To
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IEEE Magnetics Society Information IEEE Magn. Lett. (IF 1.54) Pub Date : 2021-01-11
Presents a listing of the editorial board, board of governors, current staff, committee members, and/or society editors for this issue of the publication.
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IEEE Magnetics Letters publication information IEEE Magn. Lett. (IF 1.54) Pub Date : 2021-01-11
Presents a listing of the editorial board, board of governors, current staff, committee members, and/or society editors for this issue of the publication.
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About the Cover IEEE Magn. Lett. (IF 1.54) Pub Date : 2021-01-11
Cover photograph of J. M. D. Coey by John Kelly, 2007; courtesy of School of Physics, Trinity College Dublin, all rights
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Spin Torque Effect in Magnetic Low-Frequency Noise Due to Asymmetric Oscillation IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-12-02 Thalerngsak Pipathanapoompron; Andrew Grier; Andrzej Stankiewicz; Krishnan Subramanian; Arkom Kaewrawang
In this letter, the influence of spin-transfer torque (STT) on magnetic read sensor noise in the test band of 1–200 MHz has been investigated experimentally using the macrospin model with STT term. The results reveal a dependence of the integrated noise power on the direction of bias current when an external field is applied. In a positive field direction, positive bias current produces stronger noise
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Simultaneous Independent Translational and Rotational Feedback Motion Control System for a Cylindrical Magnet Using Planar Arrays of Magnetic Sensors and Cylindrical Coils IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-11-17 Peter Berkelman; Bernadette Tix
This letter describes an electromagnetic feedback control system for rigid-body motion control of a magnet. Its novel features are that sensing and actuation using magnetometer sensors and actuator coils operate simultaneously. Magnetic field models from the controlled magnet and each of the actuator coil currents are used together to calculate the three-dimensional position and orientation of the
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Impact of Circular Apertures on Static Shielding Performances of Spherical Magnetic Shields IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-12-02 Tianhao Liu; Allard Schnabel; Liyi Li; Zhiyin Sun; Jens Voigt
The magnetic field inside a spherical magnetic shield with infinite permeability and a circular aperture in a homogeneous magnetic field of arbitrary direction is analytically derived. The closed-form formulas for the static shielding factors are theoretical upper limits for real shields. We discuss the magnetic field gradient inside the shield caused by a single aperture, implying that using symmetric
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Single-Domain Ferromagnetic Zinc-Copper Ferrite Composites for Magnetic Data Storage IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-11-20 Sugi Sreeramakrishnan; Radhika Sathasivam; Padma Chellaia Muthammal
ZnFe 2 O 4 /CuFe 2 O 4 composites in the ratios of 0.95:0.05 and 0.5:0.5 were synthesized via coprecipitation technique using polyvinyl alcohol as a surfactant. The X-ray diffraction study revealed the formation of nanosized ZnFe 2 O 4 /CuFe 2 O 4 composite crystallites with cubic phase of ZnFe 2 O 4 and tetragonal phase of CuFe 2 O 4. Scanning electron microscopy revealed the formation of octahedral
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BVA-NQSL: A Bio-Inspired Variation-Aware Nonvolatile Quaternary Spintronic Latch IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-11-10 Abdolah Amirany; Kian Jafari; Mohammad Hossein Moaiyeri
Quaternary memory and logic circuits have been studied by researchers, as they can provide denser integrated circuits and subsequently lower area and power consumption via succinct interconnects. Using multithreshold gate-all-around carbon nanotube field-effect transistors and the nonvolatile feature of magnetic tunnel junctions (MTJs), this letter proposes a bio-inspired variation-aware nonvolatile
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Inverted Hysteresis, Magnetic Domains, and Hysterons IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-10-30 Ivan Soldatov; Petru Andrei; Rudolf Schaefer
In this letter, we use magnetooptical Kerr effect magnetometry on extended samples to measure local hysteresis curves as a function of an externally applied field in a magnetostriction-free amorphous ribbon and an elliptical Permalloy film element. Although these materials are magnetically soft and have almost zero coercive field, we find that the local hysteresis curves have a highly nonlinear hysteretic
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Experimental Assessment of Coercivity Microstructural Parameters of a Nd-Fe-B Sintered Magnet IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-10-08 E. A. Perigo; R. N. Faria
We examined the microstructural parameter $\ \alpha $ in order to investigate the influence of its components on the intrinsic coercivity of an isotropic Nd-Fe-B sintered magnet. By applying boundary conditions for the assessment of grain (mis)alignment ${\alpha _\psi }$ and exchange coupling ${\alpha _{exc}}$ and combining with magnetic measurements and structural characterization results obtained
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Multitrack Detection With Two-Dimensional Hybrid Equalizer for High-Density Bit-Patterned Media Recording IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-10-02 Yushu Xu; Yao Wang; Yuan Li; Lei Chen; Yumei Wen; Ping Li
Bit-patterned media recording (BPMR) is one of the most promising candidates to further increase recording density beyond 1 Tb/in 2 . For high-density BPMR systems, severe intertrack interference (ITI) and media noise caused by decreased track pitch bring severe deterioration to the readback signals. To mitigate the impact of ITI and media noise on bit error rate (BER) performance, we developed a multitrack
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Ferromagnetism in Molybdenum Disulfide Thin Films Annealed in Magnetic Fields IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-09-08 Richa Singh; Anshika Srivastava; Shweta Tripathi
Molybdenum disulfide (MoS 2 ) is a significant material yet to be explored for its magnetic properties. In this letter, thin films of MoS 2 are grown on n-silicon substrates via a spin coating method. Deposited films are magnetically annealed at 200 °C with a varying magnetic field from 280 to 520 G. Furthermore, the effect of magnetic field annealing on the structural and magnetization properties
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Control of Domain Structure in Magnetic Microwires by Combination of Torsion and Tension Stresses IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-09-30 Alexander Chizhik; Julian Gonzalez; Arcady Zhukov; Andrzej Stupakiewicz
In this letter we study magnetization reversal and transformation of magnetic domain structures in glass-covered magnetic microwires. Studies were performed using the magneto-optical Kerr effect technique in the presence of the combination of tension and torsion mechanical stresses. Formation and reversible transformations of the surface helical structure, induced by the combined stress, were found
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Temperature Dependence of Irreversible Flux Loss Field in Sintered Ferrite Magnets: A Connection With Chemical Composition and Physical Properties IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-10-05 E. A. Périgo; R. N. Faria
This letter discusses the temperature dependence of the magnetic field at which irreversible magnetic flux loss of ferrite sintered magnets is initiated. In this material class such a field might reduce linearly: comparable behavior to that observed for Nd-Fe-B-based sintered counterparts increases linearly or even peaks for temperatures above 350 K. These differences are attributed to variations in
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Evidence of the Superparamagnetic State in the Zero-Field Microwave Susceptibility Spectra of Ferrimagnetic Nanoparticles IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-09-24 Marie Darcheville; Anne-Lise Adenot-Engelvin; Christophe Boscher; Nicolas Vukadinovic; Christophe Lefevre; André Thiaville; Clément Sanchez
We investigated the static and dynamic magnetic properties of Zn 0.4 Fe 2.6 O 4 nanoparticles synthesized by thermal decomposition. Two ranges of diameter were used: small particles (diameter about 6.2 nm) and larger ones (diameter about 22.4 nm). The nanoparticle microstructure was characterized by transmission electron microscopy. The temperature dependence of the zero-field dynamic permeability
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Impact of Scaling on Physical Unclonable Function Based on Spin–Orbit Torque IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-09-21 Vito Puliafito; Raffaele De Rose; Felice Crupi; Stefano Chiappini; Giovanni Finocchio; Marco Lanuzza; Mario Carpentieri
We analyze the scalability of a spin–orbit torque random access memory (SOT-MRAM)-based physical unclonable function (PUF) at the nanoscale size by means of a hybrid CMOS/spintronics simulation framework. The properties of the SOT-MRAM device (diameters from 100 nm down to 25 nm) are computed via micromagnetic simulations, whereas their implications for PUF applications are evaluated at the circuit
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Correlation of Binary-Code-Modulated Microwave Signals by Parametric Pumping of Spin Waves IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-08-17 Mikkel Hansen; Ivan Lisenkov; Huaping Liu; Albrecht Jander; Pallavi Dhagat
An analog microwave signal correlator, based on parametric pumping of a spin wave by a radio frequency (RF) magnetic field, is demonstrated. The binary codes to be correlated modulate the two microwave signals input to the device to, respectively, excite the spin wave and RF field at twice the carrier frequency of the spin wave. The magnetic field parametrically pumps the spin wave, generating a counterpropagating
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Unified Framework for Micromagnetic Modeling of Ferro-, Ferri-, and Antiferromagnetic Materials at Mesoscopic Scale: Domain Wall Dynamics as a Case Study IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-09-08 Luis Sánchez-Tejerina; Riccardo Tomasello; Vito Puliafito; Bruno Azzerboni; Mario Carpentieri; Giovanni Finocchio
We introduce a formulation of a two-sublattice micromagnetic model, which can describe the statics and dynamics of ferromagnets, antiferromagnets, and ferrimagnets. Such a formulation is based on the normalization of exchange, Dzyaloshinskii–Moriya interaction, and anisotropy parameters with respect to the square modulus of the saturation magnetization for each sublattice. We show a study of the statics
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Negative and Complex Reluctance in Injective Profile Section IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-09-02 Theodore Lejuste Abobda; Salome Ndjakomo Essiane; Paul Woafo
Losses in magnetic circuits are closely related to reluctance. Dealing with coils, transformers, stator poles, rotors in motors, and electromagnets with iron slabs in electrical actuators may raise the question regarding the effect of the slope of section profiles on losses and performance. In this letter, with dc and ac sources, through injective section profiles, we obtain complex, negative, and
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Effect of Oblique Versus Normal Deposition on the Properties of Perpendicularly Magnetized L10 FePd Thin Films IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-07-27 Xinjun Wang; Sergiy Krylyuk; Daniel Josell; Delin Zhang; Jian-Ping Wang; Daniel B. Gopman
Materials such as L 1 0 Fe-based alloys with perpendicular magnetic anisotropy derived from crystal structure have the potential to deliver higher thermal stability of magnetic memory elements compared to materials whose anisotropy is derived from surfaces and interfaces. A number of processing parameters enable control of the quality and texture of L 1 0 FePd; among them are substrate, deposition
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Design of a System to Compose 50 Hz Alternating and Static Magnetic Field From Induction Coil and Permanent Magnets IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-09-02 Mikus Milgrāvis; Andris Bojarevičs; Antra Gaile; Vadims Geža
We demonstrate a technical solution to achieve an intense 50 Hz alternating magnetic field and a static magnetic field made by a permanent magnet at the same place. A compact coil built using the Bitter coil concept is customized to support alternating current, thus creating an alternating magnetic field. A complementary permanent magnet assembly is built around it to achieve the superposition of both
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Optimal Array-Reader and Track Misregistration Mitigation Method in a Three-Reader/Four-Track Reading Bit-Patterned Magnetic Recording System IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-08-25 Kittipon Kankhunthod; Chaiwat Buajong; Chanon Warisarn
Track misregistration (TMR) is one of several problems in ultrahigh areal density bit-patterned magnetic recording (BPMR) systems, in which the distances between bit-islands are very narrow in both cross-track and down-track directions. Unfortunately, distance reduction leads to intersymbol interference and intertrack interference (ITI) effects, which cause system performance degradation. To deal with
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Effect of Nanomagnet Geometry on Reliability of Energy-Efficient Straintronic Spin Neuron and Memory: A Size-Dependent Study IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-08-17 Yabo Chen; Mingxu Song; Bo Wei; Xiaokuo Yang; Huanqing Cui; Jiahao Liu; Cheng Li
In this letter, a model of strain-induced nanomagnet at room temperature is established to explore the effect of size error on the reliability of straintronic memory and spin neurons. The results show that the relationship between input voltages and 180° magnetization switching probability (activation function) of the nanomagnet has a size dependence. The slope of the activation function is related
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Microstructure and Tunneling Magnetoresistive Characteristics of Laser-Irradiated Magnetic Data Recording Head IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-08-06 Pornchai Rakpongsiri; Suphakit Pintasiri; Kurt Ruthe; Sukkaneste Tungasmita
Heat-assisted magnetic recording is a future hard disk drive (HDD) technology for extremely increasing areal density. The tunneling magnetoresistive (TMR) device structure, located inside the magnetic read–write head of a hard drive, is the most complex and sensitive component, which contains sensitive components, such as a touchdown sensor and a near-field transducer. The laser used in the writing
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Study of the Working Area of a Ring Magnet Magnetic Levitation System Using a Thin Layer of Magnetic Fluid IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-08-10 Petr A. Ryapolov; Victor G. Bashtovoi; Aleksandr G. Reks; Evgeniy A. Sokolov; Eugene B. Postnikov
We present an experimental system aimed at mapping the magnetic field created by a ring magnet in the working region of a single-magnet magnetic levitation system. The key idea is based on the photoregistration of a transparent air-filled cavity formed in a thin magnetic fluid layer due to balancing the gas pressure and the pressure emerging due to magnetic forces. As a result, the contour of the magnetic
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Analysis of Rectangular Cross-Section Toroidal Helix Geometry for Winding Length Optimization IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-07-27 David B. Bowen
Recent advances in additive direct-write circuit technology have enabled the fabrication of inductive winding geometries previously considered impossible by conventional methods. In this letter, a winding fabricated around a rectangular cross-section toroidal core is considered. As an extension of research embedding toroidal cores within printed circuit board, this letter considers the minimization
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Investigations of Magnetic Properties Hg0.865Mn0.135Te by the Electron Spin Resonance Method IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-06-22 Aleksei V. Shestakov; Ilshat I. Fazlizhanov; Ivan V. Yatsyk; Maryam I. Ibragimova; Rushana M. Eremina
Mercury chalcogenide (Hg 0.865 Mn 0.135 Te) monocrystal was grown by crystallization from a two-phase mixture with replenishment of the melt from a tellurium solution and has n-type conductivity. The electron spin resonance (ESR) spectra of a single crystal were studied before and after X-irradiation. Only one intense anisotropic ESR line was observed at 4.2 K before X-irradiation. The anisotropy parameters
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Monte Carlo Simulation of Specific Heat of Alumel Alloy IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-07-27 Diego Peña Lara; Hernando Correa Gallego; Daniel Suescún Díaz
Among magnetic alloys, Alumel (95%Ni-2%Mn-2%Al-1%Si) has been widely used due to its technological applications. We fit the specific heat, at zero magnetic field, of this alloy by the Blume-Capel model for spin $\sigma =1$ on a two- and three-dimensional cubic lattice, using Monte Carlo simulation. The best results obtained on a square lattice (linear dimension $L=512$ and 1000 Monte Carlo steps per
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Skyrmions and Phase Transitions in Ferromagnetic/Ferroelectric Superlattices With Triangular Lattice IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-07-15 Ildus F. Sharafullin; Aidar G. Nugumanov; Nuriia M. Nugaeva; Hung T. Diep
This letter studies the formation of a skyrmion crystal with a noncollinear magneto-electric interaction at the interface between a ferroelectric layer and a magnetic layer with triangular lattice in a ferromagnetic/ferroelectric superlattice and its phase transition. The ground-state spin configuration is calculated by using the steepest descent method. We noted that for zero applied magnetic field
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Impact of Annealing Temperature on Tunneling Magnetoresistance Multilayer Stacks IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-06-29 Leo Schnitzspan; Joel Cramer; Jan Kubik; Mohammad Tarequzzaman; Gerhard Jakob; Mathias Kläui
The effect of annealing temperatures on the tunnel magnetoresistance (TMR) of MgO-based magnetic tunnel junctions (MTJs) has been investigated for annealing between 190 and 370°C. The TMR shows a maximum value of 215% at an annealing temperature of 330°C. A strong sensitivity of the TMR and the exchange bias of the pinned ferromagnetic layers on the annealing temperature are observed. Depending on
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Microlinear Halbach Array of Thick-Film Nd–Fe–B Magnets Utilizing Local Laser Irradiation and a Direction-Changeable External Magnetic Field IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-07-02 Dong Han; Tadahiko Shinshi; Keita Nagai; Mizuki Momosaki; Masaki Nakano
The Halbach array magnetization of thick-film Nd–Fe–B magnets using local laser irradiation is examined. A 75 µm thick isotropic Nd–Fe–B magnet is deposited on a Si substrate by pulsed laser deposition and used to form microlinear Halbach arrays. The micromagnetization patterning of the Halbach arrays is realized by a combination of pulsed magnetization and laser-assisted heating with changing the
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Opposite Partial Response Filter for Shingled Magnetic Recording Systems IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-06-22 Chi Dinh Nguyen; Thu Phuong Nguyen; Sinh Cong Lam
Shingled magnetic recording (SMR) is regarded as the most influential technology for the next-generation magnetic recording systems. The SMR tracks are partly overlapped by each other, and the SMR systems can obtain higher area densities by increasing track per inch density. As a result, this brings more interference from the adjacent sidetracks, i.e., intertrack interference (ITI) while reading the
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Perpendicular Magnetized Magnetic Random-Access Memory Cells Utilizing the Precessional Spin-Current Structure: Benefits for Modern Memory Applications IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-06-10 Georg Wolf; Bartek Kardasz; Jorge Vasquez; Thomas Boone; Deniz Bozdag; Steve Watts; Jacob Hernandez; Pradeep Manandhar; Yuan-Tung Chin; Mustafa Pinarbasi
The various memory applications such as embedded nonvolatile memory, embedded static random-access memory, and standalone dynamic random-access memory have different requirements for the performance of the perpendicular magnetic tunnel junction (pMTJ). However, in conventional pMTJ structures, the write current and stability of the free layer are directly coupled, leading to undesirable tradeoffs in
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Effect of Mg Content in Melt-Spun Mn–Bi–Mg–Sb–In Alloys on the Structure and Properties of Field-Annealed Magnets IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-06-10 Alexander M. Gabay; George C. Hadjipanayis
Mn–Bi alloys modified with Mg and other elements were recently developed into promising rare-earth-free permanent magnets through successive melt spinning, warm compaction, and short magnetic field annealing. This letter reports on the crystal structures, texture, and magnetic properties observed in Mn 50 Bi 49- $x$ Mg $x$ Sb 0.5 In 0.5 alloys ( $x$ = 0, 1.5, 3.0, 4.5) throughout these processing steps
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Magnetic Characteristics of Nd-Fe-B Permanent Magnets at High Temperature and the Effect of Temperature on High-Temperature Superconducting Levitation Performance IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-06-03 Wen Wang; Zigang Deng; Ling Chen; Zhehao Liu; Peng Wen; Jun Zheng
In the practical application of high-temperature superconducting (HTS) magnetic levitation, the influence of ambient temperature on its performance is mainly reflected in the change of magnetic characteristics of the permanent magnet guideway (PMG). In order to investigate the magnetic characteristics of the PMG at high temperature and the influence of temperature on the levitation performance of HTS
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Reducing the Length and Enhancing the Design Accuracy in the Synthesis of One-Dimensional Magnetophotonic Crystals IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-05-22 Behnam Saghirzadeh Darki; Abolghasem Zeidaabadi Nezhad
The influence of the materials that construct a one-dimensional magnetophotonic crystal (MPC) is investigated in this letter. Recently, we suggested a procedure for realizing a desirable magneto-optical performance by utilizing an MPC heterostructure. The performance to be realized consists of a desirable transmittance along with a desirable Faraday rotation angle. The synthesis procedure gives the
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Two-Dimensional Flow Field Visualization of Temperature-Sensitive Magnetic Fluids Using a Luminescent Microcapsule IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-05-15 Keiko Ishii; Ryota Aizawa; Koji Fumoto
There has been no study for measuring the comprehensive flow field of magnetic fluids. A pumpless transport system has been envisaged based on the temperature dependence of the magnetization of magnetic fluid; however, the knowledge regarding the internal flow is still limited. It is difficult to optimize the design and realize the practical use of the transport system using magnetic fluid. Therefore
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Analytical Estimation of Transition Jitter for the Heat-Assisted Magnetic Recording Process IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-05-13 Niranjan A. Natekar; R. H. Victora
In the heat-assisted magnetic recording (HAMR) process, the transition jitter is known to depend on the grain size as well as the heat spot thermal gradient. We find that the jitter also depends on the Voronoi grain size distribution, as well as exhibiting a surprising nonlinear dependence on reader width. By combining the noise due to these dependencies we used an analytical formulation to estimate
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A Novel Eddy Current Speed Sensor With a Ferrite E-Core IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-05-08 Mehran Mirzaei; Pavel Ripka; Vaclav Grim
This letter presents a novel speed sensor based on motion-induced eddy currents in conductive moving parts. The magnetic yoke is an E-shaped ferrite core. The excitation coil is on the center leg of the E-core, and two antiserially connected pick-up coils are on the side legs. Solid iron and aluminum materials are used for the moving part in the simulations and in the measurements. Two-dimensional
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Modulation Code and Multilayer Perceptron Decoding for Bit-Patterned Media Recording IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-05-07 Seongkwon Jeong; Jaejin Lee
In a bit-patterned media recording (BPMR) system, reducing the spacing between adjacent bit islands in the down- and cross-track directions increases areal density; however, two-dimensional (2-D) interference comprising intersymbol and intertrack interferences degrades the system performance. To mitigate error patterns that increase the 2-D interference in BPMRs, 2-D modulation coding schemes have
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Magnetic Properties of Ternary Fe–Ni–Ti Alloys After Severe Plastic Deformation IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-05-07 Sergey V. Taskaev; Maxim N. Ulyanov; Dmitriy V. Gunderov; Mikhail Yu. Bogush
We report on magnetic properties of Fe–Ni–Ti alloys after severe plastic deformation (SPD) by high-pressure torsion (HPT) and low-temperature annealing. SPD and low-temperature annealing considerably change the magnetization behavior. The main magnetic and structural characteristics of bulk and HPT materials were determined. The addition of small amounts of Ti and annealing at 300 °C will not lead
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One-Dimensional Serial Detection Using New Two-Dimensional Partial Response Target Modeling for Bit-Patterned Media Recording IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-04-27 Thien An Nguyen; Jaejin Lee
Bit-patterned media recording (BPMR) is a candidate technology that extends the density to up to 4 Tb/in 2 to handle large amounts of data. However, in BPMR systems, the major challenge is two-dimensional (2-D) interference, which includes intersymbol interference from the down-track direction and intertrack interference from the across-track direction. To combat 2-D interference, it is natural to
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Sputtering Growth of Low-Damping Yttrium-Iron-Garnet Thin Films IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-04-22 Jinjun Ding; Tao Liu; Houchen Chang; Mingzhong Wu
This letter reports the development of low-damping yttrium-iron-garnet (YIG) thin films via sputtering. The films were deposited by sputtering at room temperature first and were then annealed in O 2 at high temperature. It is found that the annealing temperature critically affects the structural properties of the YIG films and thereby dictates the static and dynamic properties of the films. A 75 nm
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Nanoscale Probing of Magnetic and Electrical Properties of YIG/Si (100) Thin Films Grown by Pulsed Laser Deposition IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-04-06 Anju Saroha; Tejendra Dixit; Kolla Lakshmi Ganapathi; Miryala Muralidhar; Masato Murakami; Mamidanna Sri Ramachandra Rao
Integration of yttrium iron garnet (YIG) with Si can bring new avenues for garnet-based complementary metal-oxide semiconductor compatible devices. Herein, investigations on the morphological, electrical, and magnetic properties of postgrowth annealed YIG thin films grown on Si substrate were systematically performed at nanoscale lateral resolution, employing the variants of atomic force microscopy
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Magnetic Inhomogeneity Manifestations in the Magneto-Optical Spectra of (In-Mn)As Layers IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-03-23 Elena Alexandrovna Gan'shina; Leonard Leonidovich Golik; Zoya Eduardovna Kun'kova; Georgy Sergeevich Zykov; Alexander Ivanovich Rukovishnikov; Yuri Vasil'evich Markin
Spectral, temperature, and magnetic field dependences of the magneto-optical transversal Kerr effect (TKE) as well as optical properties of (In,Mn)As samples prepared by ion implantation followed by pulsed laser melting were studied, and a strong TKE response was detected at low temperatures. The presence of a characteristic structure in the TKE spectra in the transition region around the Λ point of
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Simplified Process for the Monolithic Integration of Tunnel Magnetoresistive Sensors in a Two-Dimensional Magnetometer IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-03-23 Pedro Ribeiro; Ana V. Silva; Susana Freitas Cardoso
We present the fabrication process and characterization of a tunnel magnetoresistance sensor-based monolithic device assembled in Wheatstone bridge architecture, capable of measuring magnetic fields in both planar-sensitive directions simultaneously. This process is simplified in comparison with other fabrication strategies, as it does not require annealing or the usage of auxiliary structures to achieve
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Circuit Model for Power Link Budget Between Two Horizontal Loops Placed on Seabed IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-03-23 Eugenio Jiménez-Yguácel
In this letter, we examine underwater wireless communications using electromagnetic waves in marine shallow waters. Due to the particular environment under study (low frequencies, short distances, and small loop antennas), a magnetoquasi-static approach is used instead of full-wave analysis. The electric field generated by a constant current circular loop placed on the interface between two conductors
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Spring-Shaped Inductor Tuned With a Microelectromechanical Electrothermal Actuator IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-03-19 Fahimullah Khan; Hussein Hussein; Mohammad I. Younis
We present a spring-shaped tunable inductor, fabricated using a silicon-on-insulator (SOI) multiuser micro-electromechanical system process. The inductor has a simple planar design and is monolithically integrated in the SOI wafer. The inductor is tuned using a thermal actuator on the same silicon structure layer. Thus, the complexity and cost of fabrication are greatly minimized. The device is compact
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Spin–Orbit Torque Switching in Low-Damping Magnetic Insulators: A Micrmomagnetic Study IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-03-18 Wei-Heng Hsu; R. H. Victora
Magnetic insulators, in particular, rare-earth iron garnets, have low damping compared to metallic ferromagnetic materials due to lack of conduction electrons. In analogy to spin-transfer-torque devices, the low-damping nature is presumed to be an advantage for spintronic applications. We report that perpendicular magnetic anisotropy material with low damping actually does not favor reliable spin–orbit
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Room-Temperature Ferromagnetism Induced by Zn Vacancy Enhancement Through ZnO Nanostructure Modification IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-03-16 Yudi Darma; Shibghatullah Muhammady; Rena Widita; Kouichi Takase
Undoped ZnO nanostructures were deposited on Si (100) substrate using direct-current-unbalanced magnetron sputtering. The nanostructure modification of conelike into rod-shaped nanocolumnars is found after thermal annealing with O 2 . This modification transforms paramagnetism into room-temperature ferromagnetism, induced by Zn vacancy enhancement at the cost of O vacancies. First principles confirm
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Synthesis and Characterization of High-Purity Yttrium-Iron-Garnet Nanowires Inside a Porous Silicon Membrane by the Sol–Gel Method IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-03-16 Leili Hayati; Ashkan Ghanbarzadeh; Fabrizio Lombardi; Carmine Vittoria
Recently, nonmetallic ferromagnetic nanowires (NWs) have been implemented in porous templates. Such composite substrates are used to design various microwave, magnetic, and electronic devices. To synthesize ferrite NWs, the precursor solution consists of either magnetic nanoparticles (NPs) dispersed in a polymer as a surfactant or metal nitrates, which are used in a sol–gel method. The magnetic properties
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Ferromagnetic Microwire Systems as a High-Gradient Magnetic Field Source for Magnetophoresis IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-02-20 Anastaiya Gurevich; Anna V. Beklemisheva; Ekaterina Levada; Valeria Rodionova; Larissa V. Panina
The use of amorphous ferromagnetic microwires has potential for applications in biomedicine and biophysics. Microwire arrays create magnetic fields that are characterized by strong spatial gradients. A system of ferromagnetic microwires with magnetizations across the diameter may efficiently accumulate paramagnetic particles along the wire due to forced diffusion. For typical system parameters, the
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Hard Magnetic Properties of Co-Rich Microwires Crystallized by Current Annealing IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-02-20 Svetlana A. Evstigneeva; Makhsudsho G. Nematov; Alexander Omelyanchik; Nikolai A. Yudanov; Valeria V. Rodionova; Larissa V. Panina
Micromagnets in the form of microwires have become a subject of interest in various applications including magnetic field bias elements in miniature actuators, sensors, and manipulators. While the preparation of hard magnetic microwires with sufficiently high magnetization is a difficult task, it can be achieved by using specific crystallization techniques. We present a technique for the fabrication
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Magneto-Inductive Magnetic Gradient Tensor System for Detection of Ferromagnetic Objects IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-02-20 Huan Liu; Xiaobin Wang; Hongpeng Wang; Junchi Bin; Haobin Dong; Jian Ge; Zheng Liu; Zhiwen Yuan; Jun Zhu; Xinqun Luan
A miniature magnetic gradient tensor system may be used in small spacecraft for mineral prospecting and detection of unexploded explosive ordnance. The system consists of a magneto-inductive (MI) sensors array, a signal extraction circuit, and a microcontroller. A magnetic gradient full-tensor configuration utilizes four MI sensors arranged in a planar cross structure and is employed to minimize orientation
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High-Performance Metallic Amorphous Magnetic Flake-Based Magnetodielectric Inductors IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-02-17 Kun Qian; Alexander S. Sokolov; Qifan Li; Qifan Li; Chins Chinnasamy; Samuel Kernion; Vincent G. Harris
Flake-shaped FeSi-based metallic amorphous alloy particles, having an aspect ratio as high as 175:1, were prepared by ball-milling gas-atomized amorphous powders of an effective diameter of 20 µm. The starting powder has a saturation magnetic flux density Bs of 1.5 T and a coercivity Hc of 94 A/m. The aspect ratio of the flakes, as well as their magnetic properties, were controlled by milling process
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Study of Surface Spin-Polarized Electron Accumulation in Topological Insulators Using Scanning Tunneling Microscopy IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-01-28 Siddharth Tyagi; Michael Dreyer; David Bowen; Dan Hinkel; Patrick J. Taylor; Adam L. Friedman; Robert E. Butera; Charles Krafft; Isaak Mayergoyz
We report the results of scanning tunneling microscopy experiments using iron-coated tungsten tips and current-carrying bismuth selenide (Bi $_2$ Se $_3$ ) samples. Asymmetry in tunneling currents with respect to the change in the direction of bias currents through Bi $_2$ Se $_3$ samples has been measured. It is argued that this asymmetry is the manifestation of surface spin-polarized electron accumulation
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Magnetic Domain Structure of Y2(Fe$_{{x}}$Co1–$_{{x}}$)17 Compounds IEEE Magn. Lett. (IF 1.54) Pub Date : 2020-01-21 Elena M. Semenova; Marina B. Lyakhova; Artem I. Sinkevich; Alexey Yu Karpenkov; Yuriy G. Pastushenkov
The magnetic domain structure of Y 2 (Fe $_{x}$ Co 1– $_{x}$ ) 17 (0.03 < $ x $ < 0.88) intermetallic compounds was investigated via magnetic force microscopy. It is experimentally shown that in the range of $x$ = 0.07 − 0.5, the surface magnetic domain structure of the single crystals reveals domains with typical uniaxial magnetocrystalline anisotropy configuration. The values of the surface energy
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