单元素轨道各向异性驱动的高熵 (Fe, Co, Ni, Cr, Mn)3O4 氧化物中的晶体磁各向异性,Advanced Functional Materials

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单元素轨道各向异性驱动的高熵 (Fe, Co, Ni, Cr, Mn)3O4 氧化物中的晶体磁各向异性
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-12-26 , DOI: 10.1002/adfm.202312856
Wei-En Ke, Jia-Wei Chen, Cheng-En Liu, Yu-Chieh Ku, Chun-Fu Chang, Padraic Shafer, Shi-Jie Lin, Ming-Wen Chu, Yi-Cheng Chen, Jien-Wei Yeh, Chang-Yang Kuo, Ying-Hao Chu

多组分材料的设计由于其定制功能特性的非凡能力而引起了广泛关注。然而，单个元素如何影响整体材料的行为仍有待深入探索。在本研究中，研究了具有不同应变状态的高熵(Fe、Co、Ni、Cr、Mn) ₃ O ₄薄膜的异质外延的磁性能。发现具有压应变的高熵氧化物薄膜表现出晶体磁各向异性效应。多种分析提供了对高熵磁性氧化物系统的详细了解，包括 X 射线衍射、倒易空间映射、宏观磁性表征、X 射线吸收光谱 (XAS) 等。值得注意的是，元素特异性 XAS 技术被证明可以有效地揭示晶体磁各向异性的起源。由于衬底引起的外延应变，Mn ^3+的e_g轨道形成不同的能级，导致不同的择优电子占据。进而阐述了外延高熵氧化物薄膜磁性能的探索。通过解决随机原子分布和复杂磁相互作用带来的复杂性，这项研究开创了探测高熵氧化物核心物理的新方法。

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Crystalline Magnetic Anisotropy in High Entropy (Fe, Co, Ni, Cr, Mn)3O4 Oxide Driven by Single-Element Orbital Anisotropy

The design of multicomponent materials has captured considerable attention due to its extraordinary ability to tailor functional properties. However, how a single element affects the behavior of the overall material has yet to be explored in depth. In this study, the heteroepitaxy of high entropy (Fe, Co, Ni, Cr, Mn)₃O₄ films with varying strain states are investigated in magnetic performance. It is discovered that the high entropy oxide thin film with compressive strain exhibits an effect of crystalline magnetic anisotropy. Diverse analyses provide a detailed understanding of high entropy magnetic oxide systems, including X-ray diffraction, reciprocal space mapping, macroscopic magnetic characterization, X-ray absorption spectroscopy (XAS), etc. Notably, the element-specific XAS technique proves effective in uncovering the origin of the crystalline magnetic anisotropy. Due to the substrate-induced epitaxial strain, the e_g orbitals of Mn³⁺ form different energy levels, leading to different preferred electron occupancy. The exploration of magnetic properties in epitaxial high entropy oxide film is then raveled. By navigating the complexities introduced by the random atom distribution and intricate magnetic interactions, this study pioneers novel methodologies for probing the core physics of high entropy oxides.

更新日期：2023-12-26

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