Large exchange bias in Cr substituted Fe3O4 nanoparticles with FeO subdomains,Nanoscale

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Large exchange bias in Cr substituted Fe3O4 nanoparticles with FeO subdomains
Nanoscale ( IF 5.8 ) Pub Date : 2021-09-08 , DOI: 10.1039/d1nr04614d
Claudiu Bulbucan _{1,

2} , Calle Preger _{1,

3} , Aram Kostanyan _{4,

5} , Kirsten M Ø Jensen ₆ , Esko Kokkonen ₇ , Cinthia Piamonteze ₅ , Maria E Messing _{1,

2,

3} , Rasmus Westerström _{1,

2}

Affiliation

Tuning the anisotropy through exchange bias in bimagnetic nanoparticles is an active research strategy for enhancing and tailoring the magnetic properties for a wide range of applications. Here we present a structural and magnetic characterization of unique FeCr-oxide nanoparticles generated from seed material with a Fe : Cr ratio of 4.71 : 1 using a physical aerosol method based on spark ablation. The nanoparticles have a novel bimagnetic structure composed of a 40 nm ferrimagnetic Cr-substituted Fe₃O₄ structure with 4 nm antiferromagnetic Fe_xO subdomains. Cooling in an applied magnetic field across the Néel temperature of the Fe_xO subdomains results in a significant shift in the hysteresis, demonstrating the presence of a large exchange bias. The observed shift of μ₀H_E = 460 mT is among the largest values reported for Fe_xO–Fe₃O₄-based nanoparticles and is attributed to the large antiferromagnetic-ferrimagnetic interface area provided by the subdomains.

中文翻译：

Cr 取代的 Fe3O4 纳米粒子与 FeO 子域的大交换偏差

通过双磁性纳米粒子的交换偏置来调节各向异性是一种积极的研究策略，用于增强和定制各种应用的磁性。在这里，我们使用基于火花烧蚀的物理气溶胶方法，展示了由 Fe: Cr 比例为 4.71:1 的种子材料生成的独特 FeCr 氧化物纳米粒子的结构和磁性特征。该纳米粒子具有新颖的双磁结构，由 40 nm 亚铁磁 Cr 取代的 Fe ₃ O ₄结构和 4 nm 反铁磁 Fe _x O 子域组成。在 Fe _x O 子域的尼尔温度范围内施加磁场中进行冷却会导致磁滞发生显着变化，表明存在较大的交换偏置。观察到的μ ₀ H _E = 460 mT 的位移是 Fe _x O–Fe ₃ O ₄基纳米粒子报道的最大值之一，归因于子域提供的大反铁磁-亚铁磁界面面积。

更新日期：2021-09-14

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