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Tuning interfacial spins in antiferromagnetic/ferromagnetic/heavy-metal heterostructures via spin-orbit torque
Physical Review Applied ( IF 4.6 ) Pub Date : 
X. H. Liu, K. W. Edmonds, Z. P. Zhou, and K. Y. Wang

Antiferromagnets are outstanding candidates for the next generation of spintronic applications, with great potential for downscaling and decreasing power consumption. Recently, the manipulation of bulk properties of antiferromagnets has been realized by several different approaches. However, the interfacial spin order of antiferromagnets is an important integral part of spintronic devices, thus the successful control of interfacial antiferromagnetic spins is urgently desired. Here, we report the high controllability of interfacial spins in antiferromagnetic / ferromagnetic / heavy metal heterostructure devices using spin-orbit torque (SOT) assisted by perpendicular or longitudinal magnetic fields. Switching of the interfacial spins from one to another direction through multiple intermediate states is demonstrated. The field-free SOT-induced switching of antiferromagnetic interfacial spins is also observed, which we attribute to the effective built-in out-of-plane field due to unequal upward and downward interfacial spin populations. Our work provides a precise way to modulate the interfacial spins at an antiferromagnet / ferromagnet interface via SOT, which will greatly promote innovative designs for next generation spintronic devices.

中文翻译:

通过自旋轨道转矩调整反铁磁/铁磁/重金属异质结构的界面自旋

反铁磁体是下一代自旋电子应用的出色候选者,具有缩小规模和降低功耗的巨大潜力。最近,已经通过几种不同的方法实现了对反铁磁体的整体性质的操纵。然而,反铁磁体的界面自旋顺序是自旋电子器件的重要组成部分,因此迫切需要成功控制界面反铁磁性自旋。在这里,我们报告了在垂直或纵向磁场辅助下使用自旋轨道转矩(SOT)的反铁磁/铁磁/重金属异质结构器件中界面自旋的高度可控性。通过多个中间状态显示了界面自旋从一个方向切换到另一方向。还观察到无场的SOT诱导的反铁磁界面自旋转换,这归因于由于向上和向下的界面自旋分布不相等,有效的内置平面外场。我们的工作提供了一种精确的方法,可以通过SOT在反铁磁体/铁磁体界面上调制界面自旋,这将极大地促进下一代自旋电子器件的创新设计。
更新日期:2020-01-09
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