Giant magneto-spin-Seebeck effect and magnon transfer torques in insulating spin valves
Giant magneto-spin-Seebeck effect and magnon transfer torques in insulating spin valves
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DOI：
10.1063/1.5018411
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发表时间：
2018-01-29
影响因子：
4
通讯作者：
Zhang, Shufeng
中科院分区：
文献类型：
--
作者：
Cheng, Yihong;Chen, Kai;Zhang, Shufeng
从理论上研究了夹在两层铁磁绝缘层之间的反铁磁绝缘体构成的绝缘自旋阀(ISV)中的磁振子输运。在传统的金属基自旋阀中，电子自旋在两层金属铁磁层之间传播，产生巨磁电阻和自旋转移扭矩。在这里，ISV中的非相干磁子充当角动量载流子，并负责两个FI层之间的角动量输运。我们预测了存在温度梯度时的两种输运现象：一种是巨磁自旋-塞贝克效应，其中输出电压信号由两层FI层的相对取向控制，另一种是磁振子传递力矩，它可以用来切换FI层的磁化强度，温度梯度约为0.1Kelvin/nm。由AIP出版公司出版。
We theoretically study magnon transport in an insulating spin valve (ISV) made of an antiferromagnetic insulator sandwiched between two ferromagnetic insulator (FI) layers. In the conventional metal-based spin valve, the electron spins propagate between two metallic ferromagnetic layers, giving rise to giant magnetoresistance and spin transfer torque. Here, the incoherent magnons in the ISV serve as angular momentum carriers and are responsible for the angular momentum transport between two FI layers across the antiferromagnetic spacer. We predict two transport phenomena in the presence of the temperature gradient: a giant magneto-spin-Seebeck effect in which the output voltage signal is controlled by the relative orientation of the two FI layers and magnon transfer torque that can be used for switching the magnetization of the FI layers with a temperature gradient of the order of 0.1 Kelvin per nanometer. Published by AIP Publishing.