Demidov Vladislav E, Urazhdin Sergei, Liu Ronghua, Divinskiy Boris, Telegin Andrey, Demokritov Sergej O
Institute for Applied Physics and Center for Nanotechnology, University of Muenster, Correnstrasse 2-4, Muenster 48149, Germany.
Department of Physics, Emory University, Atlanta, Georgia 30322, USA.
Nat Commun. 2016 Jan 28;7:10446. doi: 10.1038/ncomms10446.
Utilization of pure spin currents not accompanied by the flow of electrical charge provides unprecedented opportunities for the emerging technologies based on the electron's spin degree of freedom, such as spintronics and magnonics. It was recently shown that pure spin currents can be used to excite coherent magnetization dynamics in magnetic nanostructures. However, because of the intrinsic nonlinear self-localization effects, magnetic auto-oscillations in the demonstrated devices were spatially confined, preventing their applications as sources of propagating spin waves in magnonic circuits using these waves as signal carriers. Here, we experimentally demonstrate efficient excitation and directional propagation of coherent spin waves generated by pure spin current. We show that this can be achieved by using the nonlocal spin injection mechanism, which enables flexible design of magnetic nanosystems and allows one to efficiently control their dynamic characteristics.
利用不伴随电荷流动的纯自旋电流，为基于电子自旋自由度的新兴技术（如自旋电子学和磁子学）提供了前所未有的机遇。最近有研究表明，纯自旋电流可用于激发磁性纳米结构中的相干磁化动力学。然而，由于固有的非线性自局域效应，已展示器件中的磁自振荡在空间上受到限制，这阻碍了它们在将这些自旋波用作信号载体的磁子学电路中作为传播自旋波源的应用。在此，我们通过实验证明了由纯自旋电流产生的相干自旋波的高效激发和定向传播。我们表明，这可以通过使用非局域自旋注入机制来实现，该机制能够灵活设计磁性纳米系统，并使人们能够有效地控制其动态特性。
