Magnetic Moment Orientation-Dependent Spin Dissipation in Antiferromagnets
Magnetic Moment Orientation-Dependent Spin Dissipation in Antiferromagnets
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DOI：
10.1103/physrevlett.119.267204
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发表时间：
2017-12-29
影响因子：
8.6
通讯作者：
Ono, Teruo
中科院分区：
文献类型：
--
作者：
Moriyama, Takahiro;Kamiya, Michinari;Ono, Teruo
反铁磁材料中的自旋相互作用是近年来新兴的反铁磁自旋电子学的研究热点。本文利用自旋泵效应研究了反铁磁FeMn中的自旋流相互作用。交换偏置的FeNi/FeMn薄膜，其中的Neel矢量可能是通过交换弹簧效应控制，被用来调查依赖于Neel矢量和泵浦自旋电流的极化之间的相对取向的阻尼增强。增强的阻尼和交换偏置强度之间的相关性表明，扭转的Neel矢量诱导额外的自旋耗散，这验证了Slonczewski型自旋力矩是有效的，即使在反铁磁材料。
Spin interaction in antiferromagnetic materials is of central interest in the recently emerging antiferromagnetic spintronics. In this Letter, we explore the spin current interaction in antiferromagnetic FeMn by the spin pumping effect. Exchange biased FeNi/FeMn films, in which the Neel vector can be presumably controlled via the exchange spring effect, are employed to investigate the damping enhancement depending on the relative orientation between the Neel vector and the polarization of the pumped spin current. The correlation between the enhanced damping and the strength of the exchange bias suggests that the twisting of the Neel vector induces an additional spin dissipation, which verifies that the Slonczewski-type spin torque is effective even in antiferromagnetic materials.