Asymmetric exchange bias training effect in spin glass (FeAu)/FeNi bilayers
Asymmetric exchange bias training effect in spin glass (FeAu)/FeNi bilayers
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DOI：
10.1088/1674-1056/23/10/107502
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发表时间：
2014-08
影响因子：
1.7
通讯作者：
Rui Wen-bin;He Mao-Cheng;You Biao;Shi Zhong;Zhou Shi-Ming;Xiao Ming-wen;G. Yuan;Zhang Wei;Sun Li;Du Jun
中科院分区：
文献类型：
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作者：
Rui Wen-bin;He Mao-Cheng;You Biao;Shi Zhong;Zhou Shi-Ming;Xiao Ming-wen;G. Yuan;Zhang Wei;Sun Li;Du Jun
在溅射沉积的 FeAu/FeNi 双层中观察到显着的交换偏压 (EB) 训练效应，其中交换场 (HE) 表现出特殊的符号变化温度依赖性。非常有趣的是，尽管 FeAu 自旋玻璃 (SG) 层中不存在多个易轴，但 HE 在第一个和第二个磁周期之间突然下降，随后在后续周期中出现更加逐渐连续的变化。由于磁化反转过程不对称，这种训练行为无法用经验 n−1/2 定律来描述。我们建议修改 Binek 的模型，以包括下降和上升分支处钉扎 SG 自旋的不对称变化。这个新模型成功描述了 FeAu/FeNi 双层中的 EB 训练效果。
A significant exchange bias (EB) training effect has been observed in sputter deposited FeAu/FeNi bilayers, wherein the exchange field (HE) exhibits a special sign-changeable temperature dependence. Very interestingly, despite the absence of multiple easy axes in the FeAu spin glass (SG) layer, HE drops abruptly between the first and second magnetic cycles, which is followed by a more gradual continuous change in the subsequent cycles. This training behavior cannot be described by the empirical n−1/2 law because of the asymmetric magnetization reversal processes. We propose modifying Binek's model to include the asymmetric changes of the pinning SG spins at the descending and ascending branches. This new model successfully describes the EB training effect in FeAu/FeNi bilayers.