Thermal generation of spin current in a multiferroic helimagnet
Thermal generation of spin current in a multiferroic helimagnet
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DOI：
10.1063/1.4943011
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发表时间：
2016-02
期刊：
影响因子：
6.1
通讯作者：
R. Takagi;Y. Tokunaga;Y. Tokunaga;T. Ideue;Y. Taguchi;Y. Tokura;Y. Tokura;S. Seki;S. Seki
中科院分区：
文献类型：
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作者：
R. Takagi;Y. Tokunaga;Y. Tokunaga;T. Ideue;Y. Taguchi;Y. Tokura;Y. Tokura;S. Seki;S. Seki
报道了在多铁磁镜Ba0.5Sr1.5Zn2Fe12O22中观察到的纵向自旋Seebeck效应。垂直于Ba0.5Sr1.5Zn2Fe12O22/Pt界面的温度梯度在铂中产生自旋电流起源的反自旋霍尔电压，其大小与Ba0.5Sr1.5Zn2Fe12O22的体磁化强度成正比，即使在不同的日磁和亚铁磁相之间发生连续的磁转变。这一发现表明，日磁自旋波可以成为自旋流的有效载流子。通过在铁电日磁相中利用极化电场控制以顺时针/逆时针自旋旋转为特征的自旋-螺旋性磁畴的布居比，我们发现自旋-螺旋性磁畴的分布不影响注入到铂中的自旋电流的大小。结果表明，自旋波的自旋流相对于自旋-螺旋度磁畴壁是相当强健的，而不是常规的自旋流的情况。
We report the experimental observation of longitudinal spin Seebeck effect in a multiferroic helimagnet Ba0.5Sr1.5Zn2Fe12O22. Temperature gradient applied normal to Ba0.5Sr1.5Zn2Fe12O22/Pt interface generates inverse spin Hall voltage of spin current origin in Pt, whose magnitude was found to be proportional to bulk magnetization of Ba0.5Sr1.5Zn2Fe12O22 even through the successive magnetic transitions among various helimagnetic and ferrimagnetic phases. This finding demonstrates that the helimagnetic spin wave can be an effective carrier of spin current. By controlling the population ratio of spin-helicity domains characterized by clockwise/counter-clockwise manner of spin rotation with use of poling electric field in the ferroelectric helimagnetic phase, we found that spin-helicity domain distribution does not affect the magnitude of spin current injected into Pt. The results suggest that the spin-wave spin current is rather robust against the spin-helicity domain wall, unlike the case with the conventio...