Polarized current changes the exchange bias in a current-in-plane spin valve
Polarized current changes the exchange bias in a current-in-plane spin valve
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DOI：
10.1016/j.jmmm.2008.11.100
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发表时间：
2009-06
影响因子：
2.7
通讯作者：
Xiaoli Tang;Huaiwu Zhang;Hua Su;Y. Jing;Z. Zhong
中科院分区：
文献类型：
--
作者：
Xiaoli Tang;Huaiwu Zhang;Hua Su;Y. Jing;Z. Zhong
自旋极化电流改变了具有面内电流几何结构的自旋阀中交换偏置的强度和方向。交换偏置可以通过施加电流脉冲来操纵和系统地改变。这些变化是非单调的，相对于所施加的场和电流脉冲的方向是不对称的。对于不同的电流脉冲，可以在同一样品中实现不同的交换偏置场。此外，对于具有不同交换偏置的样品，偏置场表现出依赖于所施加的脉冲。由于交换偏置的强度与反铁磁体的微磁态分布高度相关，因此我们用施加在界面反铁磁磁矩上的自旋矩来解释我们的观察结果，不包括焦耳加热和训练效应。
A spin-polarized current changes the strength and direction of the exchange bias in spin valves with a current-in-plane geometry. The exchange bias can be manipulated and systematically changed by applying current pulses. The changes are nonmonotonic and asymmetric with respect to the directions of the applied field and current pulses. For different current pulses, different exchange-bias fields can be achieved in the same sample. Furthermore, for samples with different exchange bias, the bias field exhibits a dependence on the applied pulse. Since the strength of exchange bias is highly correlated to the micromagnetic state distribution of the antiferromagnet, we explain our observations by the spin torque exerted on the interfacial antiferromagnetic moments, excluding Joule heating and training effects.