Unconventional spin currents in magnetic films

A spin current—a flow of spin angular momentum—can be carried either by spin-polarized free electrons or by magnons, the quanta of a moving collective oscillation of localized electron spins, i.e., a spin wave. Traditionally, it was assumed that a spin wave in a magnetic film with spin-sink-free sur...

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Bibliographic Details
Published in:Physical review research 2020-06, Vol.2 (2), p.023324, Article 023324
Main Authors: Bozhko, Dmytro A., Musiienko-Shmarova, Halyna Yu, Tiberkevich, Vasyl S., Slavin, Andrei N., Syvorotka, Ihor I., Hillebrands, Burkard, Serga, Alexander A.
Format: Article
Language:English
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Summary:A spin current—a flow of spin angular momentum—can be carried either by spin-polarized free electrons or by magnons, the quanta of a moving collective oscillation of localized electron spins, i.e., a spin wave. Traditionally, it was assumed that a spin wave in a magnetic film with spin-sink-free surfaces can transfer energy and angular momentum only along its propagation direction. In this work, using Brillouin light-scattering spectroscopy in combination with a theory of dipole-exchange spin-wave spectra, we show that in obliquely magnetized free magnetic films, the in-plane propagation of spin waves is accompanied by a transverse spin current along the film normal without any corresponding transverse transport of energy.
ISSN:2643-1564
2643-1564
DOI:10.1103/PhysRevResearch.2.023324