Thermal Generation of Spin Current in an Antiferromagnet
Thermal Generation of Spin Current in an Antiferromagnet
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DOI：
10.1103/physrevlett.115.266601
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发表时间：
2015-12-29
影响因子：
8.6
通讯作者：
Tokura, Y.
中科院分区：
文献类型：
--
作者：
Seki, S.;Ideue, T.;Tokura, Y.
研究了单轴反铁磁绝缘体Cr2O_3的纵向自旋Seebeck效应，其特征是在沿c轴的磁场作用下发生自旋-翻转相变。我们发现，垂直于Cr2O_3/Pt界面的温度梯度在铂中产生了自旋电流起源的自旋霍尔反电压，其大小总是与Cr2O_3中的磁化强度成正比。反常能斯特效应的可能贡献可以忽略不计。上述结果表明，反铁磁自旋波可能是自旋流的有效载流子。
The longitudinal spin Seebeck effect has been investigated for a uniaxial antiferromagnetic insulator Cr2O3, characterized by a spin-flop transition under magnetic field along the c axis. We have found that a temperature gradient applied normal to the Cr2O3/Pt interface induces inverse spin Hall voltage of spincurrent origin in Pt, whose magnitude turns out to be always proportional to magnetization in Cr2O3. The possible contribution of the anomalous Nernst effect is confirmed to be negligibly small. The above results establish that an antiferromagnetic spin wave can be an effective carrier of spin current.