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  • First-principles Study of a Half-metallic Ferrimagnetic New Full-Heusler Mn2OsGe Alloy
    SPIN (IF 1.589) Pub Date : 2020-10-14
    A. Maizia; F. Belkharroubi; M. Bourdim; F. Khelfaoui; S. Azzi; K. Amara

    Full-Heuslers are a group of materials that have repeatedly attracted the curiosity of scientists and researchers, especially for their use in the field of spintronics. In this work, we undertook a study on the structural, elastic, electronic, magnetic and thermodynamic properties of the full-Heusler Mn2OsGe alloy using the calculations of the first principles. Two approximations are used: the generalized

  • Spin Gapless Semiconductor Behavior in d∘-d Half-Heusler CrSbSr: Potential Candidate for Spintronic Application
    SPIN (IF 1.589) Pub Date : 2020-10-07
    H. Saib; S. Dergal; H. Rached; M. Dergal

    This study was to investigate theoretically the d°-d Half Heusler compound CrSbSr. We have adopted the first-principles full potential linearized augmented plane waves (FP-LAPW) method within GGA and mBJ-GGA potential. The calculated values of formation energy and elastic constants for the d∘-d HH CrSbSr compound support the thermodynamic and mechanical stability. To the best of our knowledge, there

  • Anisotropic Effect on Local Magnetic Properties of 3D Extended Ising Model
    SPIN (IF 1.589) Pub Date : 2020-08-14
    A. Elidrysy; S. Harir; A. Zouhair; Y. Boughaleb

    The magnetic properties of anisotropic 3D Ising model on a cubic lattice are studied by Monte Carlo simulation. In particular, we have considered an extended 3D Ising model with spatially uniaxial anisotropic bond randomness on the simple cubic lattice parameterized by exchange interaction parameter J, anisotropy parameter a and external longitudinal magnetic field h. The obtained numerical data clearly

  • Law of Approach to Magnetic Saturation in Nanocrystalline Pr2Co7Cx(x≤1): Effects of Carbonation
    SPIN (IF 1.589) Pub Date : 2020-08-14
    Z. Yamkane; R. Fersi; F. Z. Rachid; R. Moubah; H. Lassri; N. Mliki; S. Alleg; M. Sajieddine; L. Bessais

    We report on the effect of Carbon insertion on the microstructure and magnetic properties of nanocrystalline Pr2Co7Cx(x≤1). The Pr2Co7Cx were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and physical property measurement system (PPMS9) Quantum Design. Mean field theory was utilized to depict the temperature dependence of magnetization and deduce the exchange interactions

  • Modeling and Optimization of Refracting-Facet Spin-Photodiodes Based on Ferromagnetic Metal-Insulator-Semiconductor Tunnel Junctions
    SPIN (IF 1.589) Pub Date : 2020-08-19
    Ronel Christian Roca; Nozomi Nishizawa; Hiro Munekata

    A model for lateral-type refracting-facet spin-photodiodes based on ferromagnetic metal-insulator-semiconductor (FM-I-S) junctions is described. The model utilizes spin and charge drift-diffusion equations and spin-dependent tunneling equations which are simultaneously solved numerically in order to obtain a self-consistent solution. The model is used to analyze and optimize the refracting-facet spin-photodiode

  • Physics of Gauge Fields in Quantum Nanosciences
    SPIN (IF 1.589) Pub Date : 2020-09-08
    Seng Ghee Tan; Mansoor B. A. Jalil; Ching-Ray Chang; Shuichi Murakami

    We review the formulation of gauge fields in terms of the frame of reference as well as the space in which the frame is defined. We highlighted some recent applications of gauge physics in the momentum space — in the modern fields of the spin Hall effect, the magnon Hall, the optical Magnus and the graphene valley Hall. General procedures of gauge transformation which lead to the construction of the

  • Ab Initio Investigation of Structural, Electronic, Magnetic and Mechanical Properties of Fe2NiAl1−xGax New Heusler Alloys
    SPIN (IF 1.589) Pub Date : 2020-08-14
    A. Benkaddour; O. Cheref; N. Benkhettou; N. Mehtougui; D. Rached; I. Benkaddour; M. Caid

    This work presents ab initio study of the structural, electronic, magnetic and mechanical properties of Fe2NiAl1−xGax Heusler compounds with variable concentrations (x=0, x=0.25, x=0.50, x=0.75 and x=1) of Ga. Calculations have performed using the full-potential linearized augmented plane waves (FP-LAPW) method within generalized gradient approximation Perdew–Burke–Ernzerhof (GGA-PBE) formalism in

  • DFT Study on the Electronic Structure and the Magnetic Properties of SmFe2 and HoCo2Binary Cubic C15-Laves Phases
    SPIN (IF 1.589) Pub Date : 2020-09-14
    Toufik Benmedjahed; Ali Bentouaf; Mokhtar Berrahal; Mohammed Ameri

    In this study, we report the electronic structure properties of SmFe2 and HoCo2 binary Laves phase compounds using the density functional theory (DFT) method. We treated the exchange correlation potential with generalized gradient approximation (GGA); in addition, GGA+U (U: Hubbard correction) calculations were applied to describe the correlation effects. At the equilibrium state, the lattice parameter

  • Investigation of Structural and Dielectric Properties of Polycrystalline PbMg1∕3 Ti1∕3W1∕3O3 Tungsten Perovskite
    SPIN (IF 1.589) Pub Date : 2020-08-19
    P. Ganga Raju Achary; R. N. P. Choudhary; S. K. Parida

    Lead magnesium tungsten titanate PbMg1∕3 Ti1∕3W1∕3O3 was prepared by adopting a high-temperature solid-state reaction method. The sample has tetragonal crystal structure having average crystallite size 45.1325nm calculated using Scherer’s relation and the average grain size is about 40nm from Scanning Electron Microscope (SEM) measurement. Measurements of dielectric permittivity (εr) and loss (tanδ)

  • First-Principles Study of the New Half-Metallic Ferromagnetic Quaternary-Heusler Alloys NaXNO (X=Ca, Sr, Ba)
    SPIN (IF 1.589) Pub Date : 2020-08-19
    K. Belkacem; Y. Zaoui; S. Amari; L. Beldi; B. Bouhafs

    The first-principles approach based on density functional theory (DFT) and the full-potential linearized augmented plane-wave method were employed to investigate the structural, elastic, electronic and magnetic properties of NaXNO (X=Ca, Sr and Ba) quaternary half-Heusler alloys. The generalized gradient approximation (GGA) as parameterized by Perdew, Burke and Ernzerhof (PBE) and the modified Becke–Johnson

  • Optical and Magnetic Properties of Oxygen-Deficient Ba2MMoO6−μ (M=Mn, Fe and μ=0, 0.5, 1.0) in a Monoclinic Phase: A First-Principles Study
    SPIN (IF 1.589) Pub Date : 2020-08-19
    N. A. Shahed; M. K. Hossain; S. Khanom; M. Nishat; M. J. Alam; M. A. Hossain; F. Ahmed

    Double perovskites are usually strongly correlated electronic systems that offer many multifunctional properties and are most commonly formed in the monoclinic crystal phase. In this study, we used a first-principles DFT approach in studying the optical and magnetic aspects of Ba2MMoO6 (M=Mn, Fe) double perovskite structures in a new monoclinic phase in both their pure and oxygen-deficient form and

  • First Principle Investigation of Structural, Electronic and Optical Properties of Quaternary BxInyGa1−x−yN Compounds
    SPIN (IF 1.589) Pub Date : 2020-09-12
    M’hamed Larbi; Ali Bentouaf; Abdelkader Bouazza; Bouharkat Mbarek; Brahim Aïssa

    We report on our results obtained on the physical properties of BxInyGa1−x−yN quaternary alloys in the zinc-blende phase that are thoroughly considered by the linearized augmented plane wave method, with a full potential within density functional theory, for different concentrations x and y as employed in the Wien2k code. We calculated the structural properties, including lattice constant a0 and the

  • Effects of Si Doping on the Structural, Electronic and Optical Properties of Barium Chalcogenide BaS: A First-Principles Study
    SPIN (IF 1.589) Pub Date : 2020-06-29
    H. Absike; H. Labrim; B. Hartiti; H. Ez-Zahraouy

    In this work, the structural, electronic and optical properties of Si-doped barium chalcogenide [barium sulfide (BaS)] with different Si concentrations (0≤x≤0.25) are investigated by the first-principles calculations based on the density functional theory (DFT). The band structures, charge densities and complex dielectric functions of the pure as well as Si-doped BaS were presented and analyzed in

  • Enhancing Frequency and Reducing the Power of Spin-Torque Nanooscillator By The Generated Oersted Field
    SPIN (IF 1.589) Pub Date : 2020-06-29
    H. Bhoomeeswaran; P. Sabareesan

    The current-driven magnetization precession dynamics stimulated by Spin-Transfer Torque (STT) in a trilayer spin-valve device (typically Spin-Torque Nanooscillator (STNO)) is numerically investigated by solving the Landau–Lifshitz–Gilbert–Slonczewski (LLGS) equation. We have devised four STNO devices made of ferromagnetic alloys such as CoPt, CoFeB, Fe85B13Ni2 and EuO, which act as free and fixed layers

  • Reliability Analysis and Performance Evaluation of STT-MRAM-Based Physical Unclonable Function
    SPIN (IF 1.589) Pub Date : 2020-06-25
    You Wang; Hanchen Wang; Weisheng Zhao; Hao Cai

    Physical unclonable function (PUF) is considered as a promising primitive for variety of security applications since its appearance, such as authentication, key generators and random oracle. With the fast development of Internet of Things (IoT), the requirement for low complexity, high power efficiency and enhanced security level of PUF becomes urgent. Meanwhile, the conventional PUF instances based

  • Three Artificial Spintronic Leaky Integrate-and-Fire Neurons
    SPIN (IF 1.589) Pub Date : 2020-06-25
    Wesley H. Brigner; Xuan Hu; Naimul Hassan; Lucian Jiang-Wei; Christopher H. Bennett; Felipe Garcia-Sanchez; Otitoaleke Akinola; Massimo Pasquale; Matthew J. Marinella; Jean Anne C. Incorvia; Joseph S. Friedman

    Due to their nonvolatility and intrinsic current integration capabilities, spintronic devices that rely on domain wall (DW) motion through a free ferromagnetic track have garnered significant interest in the field of neuromorphic computing. Although a number of such devices have already been proposed, they require the use of external circuitry to implement several important neuronal behaviors. As such

  • Approximate 5-2 Compressor Cell Using Spin-Based Majority Gates
    SPIN (IF 1.589) Pub Date : 2020-06-25
    Mohammad Ali Shafiabadi; Fazel Sharifi

    One of the most interesting solutions for decreasing the static power of computational circuits is to use approximate computing. Approximate computing has been extensively considered to trade-off limited accuracy for improvements in other circuit metrics such as area, power and performance. On the other hand, the increasing leakage power and limited scalability have become serious obstacles that prevent

  • High Spin Polarization and Thermoelectric Efficiency of Half-Metallic Ferromagnetic CrYSn (Y=Ca, Sr) of Half-Heusler Compounds
    SPIN (IF 1.589) Pub Date : 2020-06-25
    B. Bouadjemi; T. Lantri; M. Matougui; M. Houari; R. Bentata; Z. Aziz; S. Bentata

    In the present work we have performed self-consistent ab-initio calculation using the full-potential linearized augmented plane-wave method (FP-LAPW), based on the density functional theory (DFT) as implemented in the Wien2k code to study the structural, electronic, magnetic, thermodynamic and thermoelectric properties of the half-heusler compound CrYSn (Y=Ca, Sr) using generalized gradient approximation

  • Theoretical Prediction of the Structural, Elastic, Electronic and Thermodynamic Properties of Binary CoP3 and Ternary FeCoP3 Skutterudites Materials
    SPIN (IF 1.589) Pub Date : 2020-06-25
    Riadh Zouablia; Ghlamallah Benabdellah; Mohamed Mokhtari; Said Hiadsi

    The structural, elastic, electronic and thermodynamic properties of skutterudite binary compound CoP3 and the ternary alloy FeCoP3 were investigated by using the full-potential linearized augmented plane-wave plus local orbitals method within the approximation GGA-PBEsol functional. The computed lattice constants, bulk moduli and the pressure derivative of the bulk moduli at the equilibrium are in

  • Electronic Structure and Ferromagnetic Properties of Doped Calcium Sulfide Ca1−xTMxS (TM = V, Cr and Co)
    SPIN (IF 1.589) Pub Date : 2020-06-25
    Amina Aiche; Abdelkader Tadjer; Hadj Moulay Ahmed Mazouz; Bendouma Doumi; Houari Khachai

    The electronic structure and magnetic properties of diluted Ca1−xTMxS (TM=V, Cr and Co) in the rocksalt structure at concentrations x=0.0625, 0.125 and 0.25 were studied using the full-potential linearized augmented plane wave approximation of the density functional theory with the Wu-Cohen generalized gradient approximation (WC-GGA) and the Tran–Blaha-modified Becke–Johnson (TB-mBJ) potential. Features

  • Magnetic Properties and Spin-Wave Excitations in Co/Mn Multilayers
    SPIN (IF 1.589) Pub Date : 2020-05-05
    A. Lekdadri; H. Salhi; H. Lassri; R. Moubah

    Co/Mn multilayers were prepared using evaporation technique under ultra-high vacuum conditions and their structural and magnetic properties were studied. The temperature dependence of the spontaneous magnetization Ms(T) was recorded for different cobalt layer thickness (tCo) ranging from 19Å to 70Å. Bloch’s law describes satisfactory the thermal change of magnetization for all samples. In addition

  • Gilbert Damping in Annealed Perpendicular Exchange Biased CoFeB/Pt/MnIr Multilayers
    SPIN (IF 1.589) Pub Date : 2020-05-05
    Hai-Lin Hu; Jia-Qi Yan; Wei Li; Xiao-Yu Yang; Shi-Tao Lou; X. L. Zhang

    Exchange bias and intrinsic Gilbert damping α0 are two important parameters in magnetic multilayers. To explore the correlation between exchange coupling and damping, the samples Ta (2.6nm)/Pt (2.5nm)/Co62Fe25B13 (0.63nm)/Pt (0.5nm)/Mn78Ir22 (t)/Ta (4nm) are deposited by using pulsed-DC magnetron sputtering. The static and dynamic magnetic responses with different thickness of antiferromagnetic MnIr

  • The Structural, Electronic, Optical and Thermo-Electric Properties of Oxynitride Perovskite CaTaO2N
    SPIN (IF 1.589) Pub Date : 2020-05-05
    K. Hocine; O. Cheref; K. Bettine; D. Rached; S. Benalia; M. Rabah; N. Benkhettou; H. Rached

    In this study, we carried out ab-initio calculations of structural, electronic, optical and thermo-electric properties of CaTaO2N compound in Pnma orthorhombic structure, using the full-potential linearized augmented plane wave method (FP-LAPW), within the framework of density functional theory (DFT). The calculated structural parameters are found to be in good agreement with the experimental results

  • Non-Equilibrium Green’s Function Modeling of the Transport Characteristics of Magnetic Tunnel Junctions Containing Anderson Impurities
    SPIN (IF 1.589) Pub Date : 2020-05-05
    Parvathy Harikumar; S. Mathi Jaya

    A nonequilibrium Green’s function (NEGF) formulation to study the transport characteristics of magnetic tunnel junctions (MTJs) that contains impurities at the barrier region and many-body interaction at the electrode region is presented. The formulation makes use of the already developed NEGF method for MTJs without any impurities and the impurity Green’s function is obtained using Haldane’s approach

  • The Road to High-Temperature Quantum Anomalous Hall Effect in Magnetic Topological Insulators
    SPIN (IF 1.589) Pub Date : 2020-03-17
    Ke He; Qi-Kun Xue

    Elevating the temperature needed to realize the quantum anomalous Hall effect (QAHE) to above 77 K or higher is the key to practical applications of the effect as well as many others based on it. Here, we briefly review the recent progresses, especially the experimental ones, on searching for magnetic topological insulators that can exhibit the QAHE at higher temperature. Based on our understanding

  • Strain-Engineered Nonlinear Hall Effect in HgTe
    SPIN (IF 1.589) Pub Date : 2020-02-28
    Cheng Chen; Huaiqiang Wang; Dinghui Wang; Haijun Zhang

    As paradigmatic phenomena, Hall effects have inspired tremendous studies of symmetry and topology in condensed matter physics. Intriguingly, a second-order nonlinear Hall effect was recently proposed in noncentrosymmetric materials even in the presence of time-reversal symmetry. This effect originates from the Berry curvature dipole of electronic band structures and was predicted in Dirac and Weyl

  • Theoretical Characterization of Thermodynamic, Magnetic and Electronic Proprieties of Full-Heusler Co2YGa (Y = V, Cr and Mn) Alloys
    SPIN (IF 1.589) Pub Date : 2020-02-10
    M. Mokhtari; D. Amari; F. Dahmane; G. Benabdellah; L. Zekri; N. Zekri

    The electronic structure, magnetism and thermal proprieties of the full-Heusler alloys Co2YGa (Y = V, Cr and Mn) have been investigated by first-principles calculations based on density functional theory with the generalized gradient approximation (GGA). Our obtained results of lattice parameters show reasonable agreement to the previously reported experimental and other theoretical studies. The calculations

  • Topological Surface Dirac Fermion in BiTeCl-Based Heterostructures
    SPIN (IF 1.589) Pub Date : 2020-02-10
    T. Zhang; Y. J. Chen; S. C. Sun; L. Kang; L. X. Yang; Z. K. Liu; H. J. Zhang; Y. L. Chen

    Inversion asymmetric topological insulator promises great potential to realize many intriguing phenomena such as intrinsic topological p–n junctions, pyroelectricity and novel topological magneto-electric effects that require inversion asymmetry. Recently, gapless helical surface Dirac fermions were observed in inversion-asymmetric BiTeCl crystal. However, heavy debate about whether BiTeCl is a topological

  • Confinement Effect Driven Quantum Spin Hall Effect in Monolayer AuTe2Cl
    SPIN (IF 1.589) Pub Date : 2020-02-10
    Guyue Zhong; Q. Xie; Gang Xu

    Based on first-principles calculations, we predict that the monolayer AuTe2Cl is a quantum spin Hall (QSH) insulator with a topological band gap about 10 meV. The three-dimensional (3D) AuTe2Cl is a topological semimetal that can be viewed as the monolayer stacking along b axis. By studying the energy-level distribution of p orbitals of Te atoms for the bulk and the monolayer, we find that the confinement

  • Quantum Spin Hall Insulators in Tin Films: Beyond Stanene
    SPIN (IF 1.589) Pub Date : 2020-01-31
    Jiaheng Li; Yong Xu

    Large-gap quantum spin Hall (QSH) insulators were previously predicted in stanene and its derivatives. Beyond stanene that is the thinnest α-Sn(111) film, we propose to explore QSH insulators in α-Sn films with different crystallographic orientations. Our first-principles calculations reveal that the thickness-dependent band gap of α-Sn(100) and α-Sn(110) films does not show a monotonic decrease as

  • Magnetic Spin Susceptibility of Graphene in Ferromagnetic State: A Tight-Binding Model Study
    SPIN (IF 1.589) Pub Date : 2020-01-31
    Sivabrata Sahu; G. C. Rout

    We report here a tight-binding model study of frequency-dependent ferromagnetic spin susceptibility of the graphene system. The tight-binding Hamiltonian consists of electron hoppings up to third-nearest-neighbors, substrate and impurity effects in the presence of Coulomb interaction of electrons separately at two in-equivalent A and B sub-lattices of graphene. To calculate magnetic susceptibility

  • Generation of Spin Currents by Magnetic Field in 𝒯- and 𝒫-Broken Materials
    SPIN (IF 1.589) Pub Date : 2020-01-31
    Jing Wang; Biao Lian; Shou-Cheng Zhang

    Pure spin currents carry information in quantum spintronics and could play an essential role in the next generation low-energy-consumption electronics. Here, we theoretically predict that the magnetic field can induce a quantum spin current without a concomitant charge current in metals without time reversal symmetry 𝒯 and inversion symmetry 𝒫 but respect the combined 𝒫𝒯 symmetry. It is governed

  • A High Reliability Sense Amplifier for Computing In-Memory with STT-MRAM
    SPIN (IF 1.589) Pub Date : 2020-01-31
    Li Zhang; Hualian Tang; Beilei Xu; Yiqi Zhuang; Junlin Bao

    In the era of big data, massive data requires processing efficiently. However, the limited data bandwidth between the memory and the processor in conventional computer systems could not meet the requirement of data transferring. Computing in-memory has been considered an effective solution to address this problem. In this paper, based on the spin transfer torque-magnetic random access memory (STT-MRAM)

  • A Low-Cost Highly Reliable Spintronic True Random Number Generator Circuit for Secure Cryptography
    SPIN (IF 1.589) Pub Date : 2019-12-23
    Iman Alibeigi; Abdolah Amirany; Ramin Rajaei; Mahmoud Tabandeh; Saeed Bagheri Shouraki

    Generation of random numbers is one of the most important steps in cryptographic algorithms. High endurance, high performance and low energy consumption are the attractive features offered by the Magnetic Tunnel Junction (MTJ) devices. Therefore, they have been considered as one of the promising candidates for next-generation digital integrated circuits. In this paper, a new circuit design for true

  • Theoretical Studies of the Structural, Electronic and Magnetic Properties of the CoFeCeZ (Z = P, As and Sb) Quaternary Heusler Alloys
    SPIN (IF 1.589) Pub Date : 2019-12-23
    F. N. Gharbi; I. E. Rabah; M. Rabah; H. Rached; D. Rached; N. Benkhettou; F. Boukabrine

    In this paper, we investigate the structural, electronic and magnetic properties of CoFeCrZ (Z=P, As,Sb) quaternary Heusler alloy, using the first-principles full potential linear muffin-tin orbital (FP-LMTO) method within the spin gradient generalized approximation (GGA) for the exchange and correlation potential. Our results demonstrate that in ferromagnetic phase, the all alloys CoFeCrZ are stable

  • Sensitivity of the Power Spectra of Thermal Magnetization Fluctuations in Low Barrier Nanomagnets Proposed for Stochastic Computing to In-Plane Barrier Height Variations and Structural Defects
    SPIN (IF 1.589) Pub Date : 2019-11-06
    Md Ahsanul Abeed; Supriyo Bandyopadhyay

    Nanomagnets with small in-plane shape anisotropy energy barriers on the order of the thermal energy have unstable magnetization that fluctuates randomly in time. They have recently emerged as promising hardware platforms for stochastic computing and machine learning because the random magnetization states can be harnessed for probabilistic bits. Here, we have studied how the statistics of the magnetization

  • Spin-Based Imprecise 4-2 Compressor for Energy-Efficient Multipliers
    SPIN (IF 1.589) Pub Date : 2019-10-28
    MohammadReza Taheri; Fazel Sharifi; MohammadAli Shafiabadi; Hamid Mahmoodi; Keivan Navi

    The 4-2 compressor has been widely employed in the design of multipliers. The considerable impact of 4-2 compressors on the efficiency of multipliers has created significant research interests in design of new compressor structures. In the vast range of error resilient applications, multiplication plays an important role in performing computation. Imprecise (approximate) realization of multiplication

  • Nonvolatile, Spin-Based, and Low-Power Inexact Full Adder Circuits for Computing-in-Memory Image Processing
    SPIN (IF 1.589) Pub Date : 2019-10-28
    Abdolah Amirany; Ramin Rajaei

    Deep submicron conventional complementary metal oxide semiconductor (CMOS) technology is facing various issues such as high static power consumption due to the increasing leakage currents. In recent years, spin-based technologies like magnetic tunnel junctions (MTJ) have emerged and shown some fascinating features to overcome the aforesaid issues of CMOS technology. The hybrid MTJ/CMOS circuits offer

  • First-Principles Study of Ferromagnetism in Iron Chromite Spinels: FeCr2O4 and CrFe2O4
    SPIN (IF 1.589) Pub Date : 2019-10-28
    C. Benhalima; S. Amari; L. Beldi; B. Bouhafs

    The structural, electronic and magnetic properties of FeCr2O4 and CrFe2O4 spinels have been investigated by the first-principles approach based on density functional theory (DFT) and the full-potential linearized augmented plane-wave method, within the generalized gradient approximation (GGA-PBE) and GGA-PBE+U scheme. The stability of these spinels in the normal and inverse phases is evaluated. The

  • First-Principles Study on a New All-d-Metal Full-Heusler-Based Shape-Memory Alloy Cd2MnPd
    SPIN (IF 1.589) Pub Date : 2019-10-28
    Zongbin Chen; Huan Wei; Heju Xu; Yongchun Gao; Tie Yang; Xiaotian Wang; Xuebin Chen

    A new all-d-metal full-Heusler alloy (Cd2MnPd) was designed based on density functional theory. Its crystal structure, band structure, density of states, magnetism, and the possibility of martensitic transformation were studied. The calculated total energy shows that the most stable cubic structure of this alloy is the L21 type at ferromagnetic (FM) state, and the equilibrium lattice constant is 6

  • First-Principle Simulation of Ferromagnetism in Gd-Doped Mg2X (X=Si, Ge and Sn)
    SPIN (IF 1.589) Pub Date : 2019-10-28
    Y. El Ahmar; A. Hallouche; A. Dahani; A. Zaoui; S. Kacimi; Z. Haddouche; M. Djebari; A. Boukortt

    Magnetic phase stability and electronic properties of Gd-doped Mg2X (X=Si, Ge and Sn) were investigated by first-principle calculations based on density functional theory. The present calculations were performed using the Generalized Gradient Approximation (PBE-GGA) and the modified Becke–Johnson (mBJ-GGA). The 4f electrons’ behavior has been investigated as a function of the Coulomb repulsion U by

  • Density Functional Theory Investigations of the Optoelectronic Properties of Li2MnGeS4 and Li2CoSnS4
    SPIN (IF 1.589) Pub Date : 2019-10-28
    Sikander Azam; Mamoona Mahboob; Sobia Ali; Malika Rani; Muhammad Irfan; Xiaotian Wang; Saleem Ayaz Khan; Mohammed Benali Kanoun; Souraya Goumri-Said

    We are attempting to study the properties of new materials based on Diamond-like semiconductors (DLS). Due to broad collection of useful properties, DLS are exciting materials to study. The novel substances Li2MnGeS4 and Li2CoSnS4 result from using a rational and guileless design approach that leads the discovery of DLSs with wide-ranging regions of optical transparency. So here, we have analyzed their

  • Effect of Next-Nearest-Neighbor Electron Hopping on Superconducting Gap of Cuprate Superconductors
    SPIN (IF 1.589) Pub Date : 2019-10-28
    Pratima Beura; Kamal L. Mohanta

    We study here a single band Hamiltonian model to describe the effect of next-nearest-neighbor (NNN) electron hopping on superconducting gap in Cuprates. The Hamiltonian consists of nearest-neighbor (NN) and next-nearest-neighbor (NNN) electron hopping integrals between the copper sides. By taking d-wave pairing symmetry into account, BCS type superconducting interaction is studied. By applying Zubarev’s

  • Spin-Polarized Currents Induced by Multichannel Magnetic Point Contacts
    SPIN (IF 1.589) Pub Date : 2019-09-17
    Vahid Fallahi; Akbar Nazari-Golshan

    We consider theoretically the spin blockade effect on the spin polarization of a current passing through a geometrically confined head-to-head 180∘ domain wall at a magnetic point contact in a two-dimensional (2D) metallic nanowire. The analysis is based on coherent scattering of the carriers by spin-dependent potential associated with the wall structure. The transmission properties of coherent states

  • Effects of Strain on the Half-Metallic and Elastic Properties of FeCrTe and CoCrSi with Clb Structure
    SPIN (IF 1.589) Pub Date : 2019-09-13
    Moaid K. Hussain

    The effects of strain on the half-metallic (HM) and elastic properties of FeCrTe and CoCrSi alloys with Clb structure were calculated using a first-principles calculation. Both compounds showed (HM) property with full spin polarization, and this property can be present when their lattice constants are in the range from 5.18 Å to 5.71 Å for CoCrSi, and 5.25 Å to 6.05 Å for FeCrTe. The calculations of

  • DFT-Based Study on Electronic, Magnetic and Thermodynamic Properties of HoMnO3: A Half-Metallic Material with Nearly Linear Band Crosses
    SPIN (IF 1.589) Pub Date : 2019-09-13
    Ting-Zhou Li; R. Khenata; Houari Khachai; Xiaotian Wang

    A novel half-metallic family of materials, the multiple Dirac cones half-metals, has received considerable interest from researchers. Benefiting from its novel electronic structure, they are promising candidates for ultra-performance spintronic devices. In this paper, we propose a new half-metallic material, perovskite-type R3−c HoMnO3, which possesses similar Dirac-like multiple linear band crosses

  • Design and Optimization of Skyrmion-Based Racetrack Memory by Overcoming Clogging and Annihilation of Skyrmion Signals
    SPIN (IF 1.589) Pub Date : 2019-09-13
    Li Zhao; Lei Qiu; Guoping Zhao; Ping Lai; Nian Ran; Xue Liang; Laichuan Shen; Fang Wang

    Magnetic skyrmions are promising building blocks for next generation data storage due to their stability, small size and extremely low currents to drive them. Skyrmion-based metallic racetrack memory has potential to replace traditional domain walls to store information as data bits, in which, however, skyrmions can drift from the direction of electron flow due to the Magnus force. In addition, skyrmion-edge

  • Magnonics and Supermagnonics
    SPIN (IF 1.589) Pub Date : 2019-07-19
    Yury Bunkov

    The magnetic community continues to discuss the possibility of observing the magnetic superfluidity, despite the fact that it has been discovered a long time ago. It was observed in antiferromagnetic states of superfluid 3He in 1984. In this paper, we reiterate the main principles of spin superfluidity and related Bose–Einstin magnon condensation. We discuss applications of this phenomenon in supermagnonic

  • Routes to Low-Energy Magnetic Electronics
    SPIN (IF 1.589) Pub Date : 2019-07-19
    Alexander Pyatakov; Alexey Kaminskiy; Eugeny Lomov; Wei Ren; Shixun Cao; Anatoly Zvezdin

    Various routes to low energy consumption magnetic electronics and magnetic memory are reviewed including field effect spintronics, magnetoelectric magnonics and straintronics. The new idea of biologically inspired straintronic image processing scheme as well as the new experimental results on electric field induced magnetic anisotropy modulation in iron garnet films are presented.

  • Iron Oxide Nanoparticles for Magnetic Hyperthermia
    SPIN (IF 1.589) Pub Date : 2019-07-19
    N. A. Usov

    Assemblies of magnetic nanoparticles show a great potential for application in biomedicine, particularly, magnetic hyperthermia. However, to achieve desired therapeutic effect in magnetic hyperthermia, the assembly of nanoparticles should have a sufficiently high specific absorption rate (SAR) in alternating magnetic field of moderate amplitude and frequency. Using the Landau–Lifshitz stochastic equation

  • Casein-Coated Iron Oxide Nanoparticles for in vitro Hyperthermia for Cancer Therapy
    SPIN (IF 1.589) Pub Date : 2019-07-19
    Milad Salimi Bani; Shadie Hatamie; Mohammad Haghpanahi; Hossein Bahreinizad; Mohammad Hossein Shahsavari Alavijeh; Reza Eivazzadeh-Keihan; Zhung Hang Wei

    Iron oxide nanoparticles (NPs) have been a very appealing choice in magnetic-mediated hyperthermia for cancer therapy. The responses of NPs to hyperthermia as a cancer treatment method are complex and variable. Herein, the heating properties of the casein-coated magnetic NPs (MNPs) under an alternating magnetic field were investigated. The casein-coated MNPs were synthesized via one-pot chemical method

  • Cellulose Acetate/Magnetic Graphene Nanofiber in Enhanced Human Mesenchymal Stem Cells Osteogenic Differentiation Under Alternative Current Magnetic Field
    SPIN (IF 1.589) Pub Date : 2019-07-19
    Shadie Hatamie; Farzaneh Mohamadyar-Toupkanlou; Samaneh Mirzaei; Mohammad Mahdi Ahadian; Simzar Hosseinzadeh; Masoud Soleimani; Wen-Jenn Sheu; Zung Hang Wei; Teng-Fu Hsieh; Wei-Chieh Chang; Chiung-Lang Wang

    The three-dimensional (3D) nano scaffold of the cellulose acetate (CA) containing graphene/cobalt nanocomposite (0.1wt.%) was fabricated via electrospinning technique, and its impact on bone regeneration was investigated. Through this aim, bone marrow mesenchymal stem cells are cultured on the CA, and graphene/cobalt (rGO/Co)/CA nanocomposite scaffold surfaces and the samples are treated under low

  • Cellular Magnetic Resonance Imaging with Superparamagnetic Iron Oxide: Methods and Applications in Cancer
    SPIN (IF 1.589) Pub Date : 2019-07-19
    Fei-Ting Hsu; Rou Sun; Chia-Ling Hsieh

    Superparamagnetic iron oxide (SPIO) has been used as a contrast agent for magnetic resonance imaging (MRI) since the late 20th century. With the development of SPIO, cellular MRI has been recognized as a suitable and highly sensitive noninvasive modality with great potential to benefit translational research. In addition to its traditional diagnostic property, latest advances have conferred SPIO with

  • Magnetoresistive Biosensors for Direct Detection of Magnetic Nanoparticle Conjugated Biomarkers on a Chip
    SPIN (IF 1.589) Pub Date : 2019-07-19
    H. T. Huang; P. Garu; C. H. Li; W. C. Chang; B. W. Chen; S. Y. Sung; C. M. Lee; J. Y. Chen; T. F. Hsieh; W. J. Sheu; H. Ouyang; W. C. Wang; C. R. Chang; C. L. Wang; M. S. Hsu; Z. H. Wei

    In this review, we introduce various magnetic biosensors that have been developed. We first explain the advantages of magnetic biosensing and their general operating principles as well as the biolabeling technique for magnetic nanoparticles. Next, we focus on magnetoresistive biosensing technologies because magnetoresistive biosensors will be an essential development direction due to the demand for

  • Biocompatibility and Hyperthermia Efficiency of Sonochemically Synthesized Magnetic Nanoparticles
    SPIN (IF 1.589) Pub Date : 2019-07-19
    Majid Talebi; Zahra Malaie Balasi; Mohammad Mahdi Ahadian; Shadie Hatamie; Mohammad Hossein Shahsavari Alavijeh; Hossein Ghafuri

    Hereby, a sonochemical method for synthesis of pure magnetic Fe3O4 nanoparticles (Fe3O4-NPs) in large scale is being introduced. Synthesis proceeds via simple approach, at room temperature, under sonication, using cheap reagents, green antioxidant-reductant reagent and without using inert gas purge as protective atmosphere condition. During this procedure, hydrogen gas releases continuously as valuable

  • Preparation and Adsorption Properties of the Graphene Modified by Magnetic Nanoparticles
    SPIN (IF 1.589) Pub Date : 2019-07-19
    Yinling Chen; Lijun He

    In this work, we used the modified Hummers method to synthesize graphene oxide, and the redox reaction of FeCl3⋅6H2O with the carboxyl group on the surface of acidified graphene was carried out to prepare magnetic nanoparticles modified on the surface of graphene (magnetic graphene nanocomposite). X-ray diffraction (XRD), Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM), Vibrating

  • Stability Analysis of Spin-Torque Nano-oscillator in the Rotating Frame
    SPIN (IF 1.589) Pub Date : 2019-06-06
    HaoHsuan Chen; Lang Zeng; ChingMing Lee; Weisheng Zhao

    Spin-torque nano-oscillators (STNOs) have become one of the emerging and novel microwave devices with the high performance and tunability of GHz range frequency. The nanopillar structure with an out-of-plane (OP) spin polarizer and an in-plane (IP) magnetized free layer (FL) has been considered as a good candidate for the STNOs. Using the local rotational coordinate transformation, a nonstationary

  • Tuning Resonance Frequency of Spin Wave Localized in an Isolated Skyrmion by Magnetoelectric Couplings
    SPIN (IF 1.589) Pub Date : 2019-05-20
    Rongzhi Zhao; Wenchao Chen; Chenglong Hu; Luyang Chen; Jian Zhang; Xianguo Liu; Xuefeng Zhang; Mi Yan

    Understanding the dynamic behavior of an isolated skyrmion with external perturbations has been obstructed due to the difficulty in experimentally observing such an instantaneous phenomenon within picoseconds. Herein, we theoretically investigated the spin-transfer-torque-induced dynamics of an isolated skyrmion excited by external nanosecond-pulse perturbations. It is found that a redshift of the

  • Development of “spin dice” — A Scalable Random Number Generator Based on Spin-Torque Switching
    SPIN (IF 1.589) Pub Date : 2019-05-20
    Akio Fukushima; Kay Yakushiji; Hitoshi Kubota; Hiroshi Imamura; Shinji Yuasa

    We have developed a random-number-generator (RNG) named “spin dice,” which employs the stochastic nature of spin-torque switching (STS) in a magnetic tunnel junction. The principle of the idea is that the switching probability first tuned around 0.5 is varied linearly with the applied current. After that, the switching results are converted into binary random numbers. We fabricated several types of

  • All Perpendicular Spin Nano-Oscillators with Composite Free Layer
    SPIN (IF 1.589) Pub Date : 2019-05-08
    Jiaqi Wei; Kaihua Cao; Hushan Cui; Kewen Shi; Wenlong Cai; Huisong Li; Yang Jing; Chao Zhao; Weisheng Zhao

    Owing to improved thermal stability and scalability, materials with perpendicular magnetic anisotropy (PMA) are extremely attractive. The all perpendicular magnetic tunnel junction (p-MTJ) devices are primarily devoted to spin transfer torque (STT)-induced switching and few works report their microwave emission. Here, we demonstrate the basic results of RF function in nanoscale p-MTJ which has two

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