Origin of biquadratic interlayer exchange coupling in Co2MnSi-based current-perpendicular-to-plane pseudo spin valves
Origin of biquadratic interlayer exchange coupling in Co2MnSi-based current-perpendicular-to-plane pseudo spin valves
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DOI：
10.1063/1.5082605
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发表时间：
2019-02-11
影响因子：
4
通讯作者：
Uemura, Tetsuya
中科院分区：
文献类型：
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作者：
Inoue, Masaki;Inubushi, Kazuumi;Uemura, Tetsuya
我们制作了电流垂直于平面的赝自旋阀（CPP PSV）具有Co2 Mn α Si0.82电极与各种Mn组合物，α，和Ag间隔，并研究了双二次层间交换耦合（90度耦合）的CPP PSV的强度，通过比较磁阻特性和自旋转移力矩诱导的磁化切换特性。实验发现：（a）90度耦合的强度随α的增加而增加;（B）在Co2 MnSi（CMS）和Ag间隔层之间插入一层CoFe层会减弱90度耦合的强度，从而抑制290 K时的90度耦合;（c）90度耦合的强度强烈依赖于温度。这些结果阐明了扩散到具有顺磁特性的Ag间隔物中的Mn原子是基于CMS的CPP PSV中的90度耦合的起源。由AIP Publishing授权出版。
We fabricated current-perpendicular-to-plane pseudo spin valves (CPP PSVs) having Co2Mn alpha Si0.82 electrodes with various Mn compositions, alpha, and an Ag spacer and investigated the strength of biquadratic interlayer exchange coupling (90 degrees coupling) in the CPP PSVs by comparing magnetoresistance characteristics and spin-transfer-torque induced magnetization switching characteristics. We experimentally found that (a) the strength of the 90 degrees coupling increased as alpha increased, (b) it was weakened by insertion of an ultrathin CoFe layer between Co2MnSi (CMS) and the Ag spacer, resulting in the suppression of the 90 degrees coupling at 290 K, and (c) it strongly depended on temperature. These results clarify that the Mn atoms diffused into an Ag spacer with paramagnetic character are the origin of the 90 degrees coupling in CMS-based CPP PSVs. Published under license by AIP Publishing.