铁磁/反铁磁/铁磁异质结构中自旋轨道矩对垂直磁化位移的控制
Controlling vertical magnetization shift by spin-orbit torque in ferromagnetic/antiferromagnetic/ferromagnetic heterostructure
摘要：
报道了在Pt/Co/Ir 25 Mn 75/Co异质结器件中利用自旋轨道矩（SOT）控制垂直磁化位移（VMS）和交换偏置.在2kOe的垂直场中施加40 mA的单脉冲后，观察到交换偏置伴随着约30%的相对VMS。此外，还观察到无场SOT引起的VMS和交换偏置的变化，这可能与由于不相等的向上和向下界面自旋布居导致的有效内建面外场有关。SOT引起的面外界面自旋的切换分数显示出对相对VMS的线性依赖性，表明未补偿的钉扎自旋的数量与切换的界面自旋成比例。我们的发现提供了一个全面的理解，电操纵界面的AFM材料的自旋。
英文摘要：
We report the control of vertical magnetization shift (VMS) and exchange bias through spin-orbit torque (SOT) in Pt/Co/Ir25Mn75/Co heterostructure device. The exchange bias accompanying with a large relative VMS of about 30 % is observed after applying a single pulse 40 mA in perpendicular field of 2 kOe. Furthermore, the field-free SOT-induced variations of VMS and exchange bias is also observed, which would be related to the effective built-in out-of-plane field due to unequal upward and downward interfacial spin populations. The SOT-induced switched fraction of out-of-plane interfacial spins shows a linear dependence on relative VMS, indicating the number of uncompensated pinned spins are proportional to the switched interfacial spins. Our finding offers a comprehensive understanding for electrically manipulating interfacial spins of AFM materials.
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