摘要
Dzyaloshinskii-Moriya相互作用(DMI)在合成磁性多层膜体系和自旋电子技术中扮演着重要的作用.这种非共线相互作用在磁性多层膜体系中包括两种形式:界面DMI和层间DMI.对于界面DMI,其单易轴性和各向异性特征都已被发现,为拓扑自旋的技术发展奠定了基础.然而,到目前为止,有关层间DMI的研究都是单易轴性的,层间DMI的各向异性特征尚未报道.本文结合实验和理论结果,报道了[Co/Pd]多层结构中的各向异性层间DMI,这种层间手性相互作用可引起在互为60°的两个方向上的非对称磁化翻转行为.第一性原理计算表明,层间DMI的各向异性是由面心立方结构中沿(111)面两个能量较低的高对称方向上的面内反演对称性破缺导致.各向异性层间DMI的发现不仅揭示了磁性多层膜中长程层间耦合相互作用的起源,也为基于磁性多层膜的自旋电子学器件设计提供了新的途径.
The Dzyaloshinskii-Moriya interaction(DMI)has stimulated immense interests in the condensed matter physics community and is thought to be operative in crystal structures without space inversion symmetry[1,2]or appear in the thin heterostructure lacking inversion symmetry[1,3].Different from the conventional symmetric Heisenberg exchange interaction which stabilizes the collinear spin alignments,interfacial DMI prefers the non-collinear spin structures such as chiral domain walls and magnetic skyrmions[4-6]that are promising candidates for spin-based information devices[5,7,8].
作者
陈如意
徐峰
崔琪睿
梁敬华
周永健
王宁
潘峰
薛飞
杨洪新
宋成
Ruyi Chen;Feng Xu;Qirui Cui;Jinghua Liang;Yongjian Zhou;Ning Wang;Feng Pan;Fei Xue;Hongxin Yang;Cheng Song(Key Laboratory of Advanced Materials(MOE),School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China;Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions,High Magnetic Field Laboratory,Chinese Academy of Sciences,Hefei 230031,China;National Laboratory of Solid State Microstructures,School of Physics,Nanjing University,Nanjing 210093,China;Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China;Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China)
基金
supported by the National Key Research and Development Program of China (2021YFB3601301,2022YFA1405100,and 2022YFA1403601)
the National Natural Science Foundation of China (52225106,12241404,12150011,and 12174405)
supported by High Magnetic Field Laboratory of Anhui Province。
