Spin-Orbit-Torque Efficiency in Compensated Ferrimagnetic Cobalt-Terbium Alloys
Spin-Orbit-Torque Efficiency in Compensated Ferrimagnetic Cobalt-Terbium Alloys
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DOI：
10.1103/physrevapplied.6.054001
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发表时间：
2016-11-02
影响因子：
4.6
通讯作者：
Liu, Luqiao
中科院分区：
文献类型：
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作者：
Finley, Joseph;Liu, Luqiao
尽管反铁磁耦合材料具有信息存储的潜在优势，但由于磁矩被抵消，人们是否可以有效地控制磁矩取向仍然不清楚。在这里，我们报告自旋轨道转矩诱导的亚铁磁性Co 1-xTbx薄膜的垂直磁各向异性的磁化翻转。电流感应开关被证明在所有的研究薄膜组合物，包括那些附近的磁化补偿点。自旋-轨道-力矩诱导的有效场在畴壁运动机制中被进一步量化。在补偿点附近证实了与磁矩倒数成比例的发散行为，这与角动量守恒是一致的。此外，我们还量化的Dzyaloshinskiii-Moriya在Ta/Co 1-xTbx系统的相互作用能，我们发现，能量密度作为Tb浓度的函数增加。所展示的自旋-轨道-转矩切换，结合快速的磁动力学和亚铁磁合金的最小净磁化，有望使自旋电子器件比传统的铁磁系统更快，密度更高。
Despite the potential advantages of information storage in antiferromagnetically coupled materials, it remains unclear whether one can control the magnetic-moment orientation efficiently because of the canceled magnetic moment. Here, we report spin-orbit-torque-induced magnetization switching of ferrimagnetic Co1-xTbx films with perpendicular magnetic anisotropy. Current-induced switching is demonstrated in all of the studied film compositions, including those near the magnetization compensation point. The spin-orbit-torque-induced effective field is further quantified in the domain-wall motion regime. A divergent behavior that scales with the inverse of magnetic moment is confirmed close to the compensation point, which is consistent with angular momentum conservation. Moreover, we also quantify the Dzyaloshinskii-Moriya interaction energy in the Ta/Co1-xTbx system and we find that the energy density increases as a function of the Tb concentration. The demonstrated spin-orbit-torque switching, in combination with the fast magnetic dynamics and minimal net magnetization of ferrimagnetic alloys, promises spintronic devices that are faster and with higher density than traditional ferromagnetic systems.