Co基Heusler合金薄膜的结构与性能研究进展-中国材料进展

文章信息/Info

Title:: Research Progress in Structures and Properties of Co-Based Heusler Alloys

作者:: 童树成1; 2; 鲁军2; 缪冰锋3; 魏大海1; 2; 4; 赵建华1; 2; 4; （1. 中国科学院半导体研究所半导体超晶格国家重点实验室，北京 100083）（2. 北京量子信息科学研究院，北京 100193）（3. 南京大学物理学院固体微结构物理国家重点实验室，江苏南京 210093）（4. 中国科学院大学材料科学与光电技术学院，北京 100190）

Author(s):: TONG Shucheng1; 2; LU Jun2; MIAO Bingfeng3; WEI Dahai1; 2; 4; ZHAO Jianhua1; 2; 4; (1. State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China) (2. Beijing Academy of Quantum Information Science, Beijing 100193, China) (3. National Laboratory of Solid State Microstructures, Department of Physics, Nanjing University, Nanjing 210093, China) （4. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100190, China)

Keywords:: Heusler alloy; magnetic tunneling junction; Weyl semimetal; molecular-beam epitaxy (MBE)

摘要:: Co基Heusler合金通常具有远高于室温的居里温度、高自旋极化率、低磁阻尼因子，且与GaAs、MgO等衬底均具有良好的晶格匹配度，在磁性隧道结、自旋阀、磁传感器等自旋电子学器件中展示出潜在的应用前景，受到广泛的关注。首先介绍Co基Heusler合金的结构特征、磁性和半金属性等性质，综述近年来研究人员通过替换元素、调整原子有序度或化学计量比等手段调控其物理性质方面的研究成果。随后，阐述其在自旋电子学器件中的应用，着重介绍其作为插层，在优化L10-MnAl基磁性隧道结性质中起到的作用。最后，重点探讨新近发现并引起关注的磁性Weyl半金属Co2MnGa的磁学和输运性质，展望拓扑非平庸电子态的引入对Co基Heusler合金应用的提升和拓展。

Abstract:: Co-based Heusler alloys have been extensively researched theoretically and experimentally for their high Curie temperature, high spin polarization and good matching to GaAs and MgO substrates, which renders them preferred in spintronic devices. In this review, the structure, magnetic properties and half-metallicity of Co-based Heusler alloys are introduced, and recent progress in exploring and improving the physical properties via substituting atoms, adjusting atomic order or stoichiometric compositions are summarized. Then, brief descriptions about its application in spintronic devices are given, an intense focus is put on magnetic tunneling junction devices with L10-MnAl. Finally, the magnetic and transport features of lately discovered magnetic Weyl semimetal Co2MnGa are presented, and an outlook for its potential application is provided.