Spin-current emission governed by nonlinear spin dynamics.
Spin-current emission governed by nonlinear spin dynamics.
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DOI：
10.1038/srep15158
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发表时间：
2015-10-16
影响因子：
4.6
通讯作者：
Ando K
中科院分区：
文献类型：
--
作者：
Tashiro T;Matsuura S;Nomura A;Watanabe S;Kang K;Sirringhaus H;Ando K
传导电子和局域磁化之间的耦合是自旋电子器件中各种现象的原因。这种耦合使得能够从动态磁化产生自旋电流。由于磁化动力学的非线性，通过动态自旋交换耦合的自旋电流发射提供了一条非线性产生自旋电流的途径。在这里，我们证明了自旋电流发射的非线性磁化动力学在金属/磁性绝缘体双层。从磁性绝缘体的自旋电流发射探测的逆自旋霍尔效应，这表明非平凡的温度和激发功率依赖的电压产生。实验结果表明，非线性磁化动力学和增强的自旋电流发射由于磁振子散射的温度降低触发。这一结果说明了非线性磁振子相互作用在动态磁化驱动的自旋电流发射中的关键作用，或非平衡磁振子，从磁性绝缘体。
Coupling between conduction electrons and localized magnetization is responsible for a variety of phenomena in spintronic devices. This coupling enables to generate spin currents from dynamical magnetization. Due to the nonlinearity of magnetization dynamics, the spin-current emission through the dynamical spin-exchange coupling offers a route for nonlinear generation of spin currents. Here, we demonstrate spin-current emission governed by nonlinear magnetization dynamics in a metal/magnetic insulator bilayer. The spin-current emission from the magnetic insulator is probed by the inverse spin Hall effect, which demonstrates nontrivial temperature and excitation power dependences of the voltage generation. The experimental results reveal that nonlinear magnetization dynamics and enhanced spin-current emission due to magnon scatterings are triggered by decreasing temperature. This result illustrates the crucial role of the nonlinear magnon interactions in the spin-current emission driven by dynamical magnetization, or nonequilibrium magnons, from magnetic insulators.