Observation of Spin-Splitter Torque in Collinear Antiferromagnetic RuO2
Observation of Spin-Splitter Torque in Collinear Antiferromagnetic RuO2
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DOI：
10.1103/physrevlett.129.137201
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发表时间：
2022-09-19
影响因子：
8.6
通讯作者：
Nitta, Junsaku
中科院分区：
文献类型：
--
作者：
Karube, Shutaro;Tanaka, Takahiro;Nitta, Junsaku
理论上预测自旋分裂效应会通过反铁磁体中的自旋分裂带产生具有 x 和 z 自旋极化的非常规自旋流。所产生的扭矩，即自旋分离器扭矩，对于自旋电子器件（例如 MRAM）而言，对于在没有外部磁场的情况下操纵相邻磁性层中的磁化是有效的。在这里，我们研究了具有 (100)、(101) 和 (001) 晶面的共线反铁磁 RuO2 中扭矩的产生。接下来，我们找到所有 x、y 和 z 极化自旋电流，具体取决于 RuO2(101) 中的 Ne ' el 矢量方向。对于 RuO2(100) 和 (001)，仅存在 y 极化自旋电流，其与 Ne'el 矢量无关。使用 z 极化自旋电流，我们演示了室温下垂直磁化铁磁体的无场切换。 RuO2 产生的自旋分裂扭矩被证实对开关现象有用，并为进一步了解自旋分裂效应的详细机制和开发反铁磁自旋轨道电子学铺平了道路。
The spin-splitter effect is theoretically predicted to generate an unconventional spin current with x- and z- spin polarization via the spin-split band in antiferromagnets. The generated torque, namely, spin-splitter torque, is effective for the manipulation of magnetization in an adjacent magnetic layer without an external magnetic field for spintronic devices such as MRAM. Here, we study the generation of torque in collinear antiferromagnetic RuO2 with (100), (101), and (001) crystal planes. Next we find all x-, y-, and z-polarized spin currents depending on the Ne ' el vector direction in RuO2(101). For RuO2(100) and (001), only y-polarized spin current was present, which is independent of the Ne ' el vector. Using the z-polarized spin currents, we demonstrate field-free switching of the perpendicular magnetized ferromagnet at room temperature. The spin-splitter torque generated from RuO2 is verified to be useful for the switching phenomenon and paves the way for a further understanding of the detailed mechanism of the spin-splitter effect and for developing antiferromagnetic spin-orbitronics.