Exchange-coupling-induced fourfold magnetic anisotropy in CoFeB/FeRh bilayer grown on SrTiO_(3)(001)  

作　　者：Qingrong Shao Jing Meng Xiaoyan Zhu Yali Xie Wenjuan Cheng Dongmei Jiang Yang Xu Tian Shang Qingfeng Zhan 邵倾蓉;孟婧;朱晓艳;谢亚丽;程文娟;蒋冬梅;徐杨;商恬;詹清峰(Key Laboratory of Polar Materials and Devices(MOE),School of Physics and Electronic Science,East China Normal University,Shanghai 200241,China;Key Laboratory of Magnetic Materials and Devices,Ningbo Institute of Material Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China)

机构地区：[1]Key Laboratory of Polar Materials and Devices(MOE),School of Physics and Electronic Science,East China Normal University,Shanghai 200241,China [2]Key Laboratory of Magnetic Materials and Devices,Ningbo Institute of Material Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China

出　　处：《Chinese Physics B》2022年第8期605-611,共7页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.11874150,51871233,and 12174103);the Natural Science Foundation of Shanghai(Grant Nos.21ZR1420500 and 21JC1402300)。

摘　　要：Exchange coupling across the interface between a ferromagnetic(FM)layer and an antiferromagnetic(AFM)or another FM layer may induce a unidirectional magnetic anisotropy and/or a uniaxial magnetic anisotropy,which has been extensively studied due to the important application in magnetic materials and devices.In this work,we observed a fourfold magnetic anisotropy in amorphous Co Fe B layer when exchange coupling to an adjacent Fe Rh layer which is epitaxially grown on an SrTiO_(3)(001)substrate.As the temperature rises from 300 K to 400 K,Fe Rh film undergoes a phase transition from AFM to FM phase,the induced fourfold magnetic anisotropy in the Co Fe B layer switches the orientation from the Fe Rh<110>to Fe Rh<100>directions and the strength is obviously reduced.In addition,the effective magnetic damping as well as the two-magnon scattering of the Co Fe B/Fe Rh bilayer also remarkably increase with the occurrence of magnetic phase transition of Fe Rh.No exchange bias is observed in the bilayer even when Fe Rh is in the nominal AFM state,which is probably because the residual FM Fe Rh moments located at the interface can well separate the exchange coupling between the below pinned Fe Rh moments and the Co Fe B moments.

关 键 词：magnetic anisotropy phase transition CoFeB/FeRh exchange coupling 

分 类 号：O469[理学—凝聚态物理]