Spin-relaxation modulation and spin-pumping control by transverse spin-wave spin current in Y3Fe5O12
Spin-relaxation modulation and spin-pumping control by transverse spin-wave spin current in Y3Fe5O12
复制标题
DOI：
10.1063/1.4817076
复制
发表时间：
2013-07
影响因子：
4
通讯作者：
Y. Kajiwara;K. Uchida;D. Kikuchi;T. An;Y. Fujikawa;E. Saitoh
中科院分区：
文献类型：
--
作者：
Y. Kajiwara;K. Uchida;D. Kikuchi;T. An;Y. Fujikawa;E. Saitoh
研究了面内温度梯度下Y3Fe5O12晶体中的热电流诱导自旋弛豫。我们表明，铁磁共振谱的线宽，即，在Y3Fe5O12膜中的自旋弛豫根据温度梯度方向而增加或减少，并且这种调制归因于由Y3Fe5O12膜中的热诱导横向自旋波自旋电流引起的自旋转移力矩。实验结果还表明，自旋泵产生的自旋电流的大小是成反比的调制吉尔伯特阻尼常数的平方，与现象学的自旋泵模型。
Heat-current-induced manipulation of spin relaxation in Y3Fe5O12 under an in-plane temperature gradient is investigated. We show that the linewidth of the ferromagnetic resonance spectrum, i.e., the spin relaxation, in an Y3Fe5O12 film increases or decreases depending on the temperature-gradient direction and that this modulation is attributed to the spin-transfer torque caused by a thermally induced transverse spin-wave spin current in the Y3Fe5O12 film. The experimental results also show that the spin-current magnitude generated by spin pumping in an attached Pt film is inversely proportional to the square of the modulated Gilbert damping constant, consistent with a phenomenological spin-pumping model.