Exchange bias and Verwey transition in Fe5C2/Fe3O4 core/shell nanoparticles,Nanoscale

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Exchange bias and Verwey transition in Fe5C2/Fe3O4 core/shell nanoparticles
Nanoscale ( IF 5.8 ) Pub Date : 2021-09-06 , DOI: 10.1039/d1nr04520b
M Xing ₁ , Jeotikanta Mohapatra ₁ , J Elkins ₁ , D Guragain ₂ , S R Mishra ₂ , J Ping Liu ₁

Affiliation

This report presents new findings of exchange bias and related structural and magnetic properties in iron carbide/magnetite (Fe₅C₂/Fe₃O₄) core/shell nanoparticles. The exchange bias emerges from an energetic landscape, namely a first-order phase transition–the Verwey transition at 125 K, during which the Fe₃O₄ shell changes from the cubic to monoclinic structure. The phase transition leads to the exchange bias because it results in abrupt changes in magnetocrystalline anisotropy and exchange coupling. Another unique phenomenon identified in this composite system is enhanced magnetic coercivity due to the uniaxial anisotropy of the monoclinic phase. An analysis of the correlations between the observed phenomena is given based on the temperature dependence of the coercivity, the exchange bias field values, and the Verwey transition temperature.

中文翻译：

Fe5C2/Fe3O4 核/壳纳米粒子中的交换偏压和 Verwey 跃迁

本报告介绍了碳化铁/磁铁矿 (Fe ₅ C ₂ /Fe ₃ O ₄ ) 核/壳纳米粒子中交换偏差和相关结构和磁性的新发现。交换偏向产生于能量图景，即一阶相变 - 125 K 的 Verwey 相变，在此期间 Fe ₃ O ₄壳由立方结构变为单斜结构。相变导致交换偏置，因为它导致磁晶各向异性和交换耦合的突然变化。在该复合系统中发现的另一个独特现象是由于单斜相的单轴各向异性而导致的矫顽力增强。根据矫顽力的温度依赖性、交换偏置场值和 Verwey 转变温度，对观察到的现象之间的相关性进行了分析。

更新日期：2021-09-14

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