Spin-wave relaxation by Eddy Currents in Y3Fe5 O12/Pt bilayers and a way to suppress it

Sergey A. Bunyaev, Rostyslav O. Serha, Halyna Yu Musiienko-Shmarova, Alexander J.E. Kreil, Pascal Frey, Dmytro A. Bozhko, Vitaliy I. Vasyuchka, Roman V. Verba, Mikhail Kostylev, Burkard Hillebrands, Gleb N. Kakazei, Alexander A. Serga

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

Because of their record-low intrinsic magnetic damping properties, single-crystal yttrium-iron-garnet (YIG) films serve as an excellent model medium for studying magnon-induced spintronic phenomena such as spin pumping and the spin-orbit torque effect. For this purpose, YIG films are covered with sub-skin-depth layers of nonmagnetic heavy metals with strong spin-orbit coupling. In the present work, we show experimentally and theoretically that ohmic losses of spin-wave-induced microwave eddy currents in the heavy-metal layer deliver a strong contribution to spin-wave damping in these hybrid structures. We demonstrate that this adverse effect can be controlled and largely eliminated by placing a highly conducting metal plate near to the surface of the YIG/Pt structures. These findings are of value for a proper interpretation of experiments on the magnon spintronic effects and for the design of future magnon spintronic devices.

Original languageEnglish
Article number024094
JournalPhysical Review Applied
Volume14
Issue number2
DOIs
Publication statusPublished - Aug 2020

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