Excitation of coherent propagating spin waves by pure spin currents

Vladislav E. Demidov (), Sergei Urazhdin, Ronghua Liu, Boris Divinskiy, Andrey Telegin and Sergej O. Demokritov
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Vladislav E. Demidov: Institute for Applied Physics and Center for Nanotechnology, University of Muenster
Sergei Urazhdin: Emory University
Ronghua Liu: Emory University
Boris Divinskiy: Institute for Applied Physics and Center for Nanotechnology, University of Muenster
Andrey Telegin: M.N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences
Sergej O. Demokritov: Institute for Applied Physics and Center for Nanotechnology, University of Muenster

Nature Communications, 2016, vol. 7, issue 1, 1-6

Abstract: Abstract 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.

Date: 2016
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DOI: 10.1038/ncomms10446

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