Tuning the direction of exchange bias in ferromagnetic/antiferromagnetic bilayer by angular-dependent spin-polarized current
Tuning the direction of exchange bias in ferromagnetic/antiferromagnetic bilayer by angular-dependent spin-polarized current
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DOI：
10.1063/1.4757906
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发表时间：
2012-10
影响因子：
3.2
通讯作者：
Xiaoli Tang;Hua Su;Huaiwu Zhang;Y. Jing;Z. Zhong
中科院分区：
文献类型：
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作者：
Xiaoli Tang;Hua Su;Huaiwu Zhang;Y. Jing;Z. Zhong
在NiFe/IrMn双层膜中观察到了外加磁场与面内交变脉冲的角度依赖性，该脉冲引起了一个新的交换偏置方向。随着电流脉冲的增大，电子束场的方向逐渐沿着外场方向，并最终确定新的电子束方向。当外加脉冲大于临界电流时，也能立即沿外场沿着产生新的电子束方向。由于电子束的强度和方向与反铁磁体的微磁态分布密切相关，因此，我们用反铁磁磁矩上的自旋力矩解释了观测结果，为反铁磁体中自旋转移和电流诱导开关的预测提供了证据.
The angular dependence of an external magnetic field applied with an in-plane alternating pulse that induces a new direction of exchange bias (EB) is observed in an NiFe/IrMn bilayer. Depending strongly on the direction of the external field, EB field gradually orients along the external field with the increase in current pulse, and the new direction of EB is finally established. Furthermore, the new direction of EB can also be induced along the external field at once when the applied pulse is larger than the critical current. Because the strength and direction of the EB is highly correlated with the micromagnetic state distribution of the antiferromagnet, the observations are explained by the spin torque exerted on the antiferromagnetic moments and provide evidence for the prediction of spin transfer and current-induced switching in antiferromagnets.