Optically excited spin pumping mediating collective magnetization dynamics in a spin valve structure
Optically excited spin pumping mediating collective magnetization dynamics in a spin valve structure
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DOI：
10.1103/physrevb.98.060406
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发表时间：
2018-08-13
影响因子：
3.7
通讯作者：
Bayer, M.
中科院分区：
文献类型：
--
作者：
Danilov, A. P.;Scherbakov, A. V.;Bayer, M.
我们演示了自旋泵，即，通过旋进磁化产生纯自旋电流，而不应用自旋泵实验中常用的微波辐射。我们使用飞秒激光脉冲，同时推出的两个铁磁层的基于galfenol自旋阀的磁化进动和监测的时间演化的磁化。由进动产生的自旋电流导致两个层的动态耦合。这种耦合具有耗散特性，并且当两个层中的进动频率处于共振时特别有效，其中形成具有强烈不同衰减率的耦合模式。
We demonstrate spin pumping, i.e., the generation of a pure spin current by precessing magnetization, without the application of microwave radiation commonly used in spin pumping experiments. We use femtosecond laser pulses to simultaneously launch the magnetization precession in each of two ferromagnetic layers of a galfenol-based spin valve and monitor the temporal evolution of the magnetizations. The spin currents generated by the precession cause a dynamic coupling of the two layers. This coupling has a dissipative character and is especially efficient when the precession frequencies in the two layers are in resonance, where coupled modes with strongly different decay rates are formed.