Influence of exchange bias on spin torque ferromagnetic resonance for quantification of spin–orbit torque efficiency  

作　　者：赵乾 张腾飞 何斌 李子木 张森富 于国强 王建波 刘青芳 魏晋武 Qian Zhao;Tengfei Zhang;Bin He;Zimu Li;Senfu Zhang;Guoqiang Yu;Jianbo Wang;Qingfang Liu;Jinwu Wei(Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education,Lanzhou University,Lanzhou 730000,China;Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;Key Laboratory of Special Functional Materials and Structural Design,Ministry of Education,Lanzhou University,Lanzhou 730000,China)

机构地区：[1]Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education,Lanzhou University,Lanzhou 730000,China [2]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [3]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China [4]Key Laboratory of Special Functional Materials and Structural Design,Ministry of Education,Lanzhou University,Lanzhou 730000,China

出　　处：《Chinese Physics B》2024年第5期688-694,共7页中国物理B（英文版）

基　　金：Project supported by the National Key Research and Development Program of China(Grant No.2021YFB3601300);the National Natural Science Foundation of China(Grant Nos.52201290,12074158,and 12174166);the Fundamental Research Funds for the Central Universities(Grant No.lzujbky-2022-kb01)。

摘　　要：Antiferromagnet(AFM)/ferromagnet(FM)heterostructure is a popular system for studying the spin–orbit torque(SOT)of AFMs.However,the interfacial exchange bias field induces that the magnetization in FM layer is noncollinear to the external magnetic field,namely the magnetic moment drag effect,which further influences the characteristic of SOT efficiency.In this work,we study the SOT efficiencies of IrMn/NiFe bilayers with strong interfacial exchange bias by using spin-torque ferromagnetic resonance(ST-FMR)method.A full analysis on the AFM/FM systems with exchange bias is performed,and the angular dependence of magnetization on external magnetic field is determined through the minimum rule of free energy.The ST-FMR results can be well fitted by this model.We obtained the relative accurate SOT efficiencyξ_(DL)=0.058 for the IrMn film.This work provides a useful method to analyze the angular dependence of ST-FMR results and facilitates the accurate measurement of SOT efficiency for the AFM/FM heterostructures with strong exchange bias.

关 键 词：ANTIFERROMAGNETS spin-orbit torque exchange bias spin torque ferromagnetic resonance 

分 类 号：O469[理学—凝聚态物理]