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Controlling Gilbert damping in a YIG film using nonlocal spin currents

Journal article
Authors Mohammad Haidar
Philipp Dürrenfeld
Mojtaba Ranjbar
Michael Balinsky
Masoumeh Fazlali
Mykola Dvornik
Randy K. Dumas
Johan Åkerman
Published in Physical Review B - Condensed Matter and Materials Physics
Volume 94
ISSN 1098-0121
Publication year 2016
Published at Department of Physics (GU)
Language en
Links https://journals.aps.org/prb/abstra...
Subject categories Magnetism, Nano Technology, Other electrical engineering, electronics and photonics

Abstract

We demonstrate the control of Gilbert damping in 65-nm-thick yttrium iron garnet (YIG) films using a spin-polarized current generated by a direct current through a nanocontact, spin filtered by a thin Co layer. The magnetodynamics of both the YIG and the Co layers can be excited by a pulse-modulated microwave current injected through the nanocontact and the response detected as a lock-in amplified voltage over the device. The spectra show three clear peaks, two associated with the ferromagnetic resonance (FMR) in each layer, and an additional Co mode with a higher wave vector proportional to the inverse of the nanocontact diameter. By varying the sign and magnitude of the direct nanocontact current, we can either increase or decrease the linewidth of the YIG FMR peak consistent with additional positive or negative damping being exerted by the nonlocal spin current injected into the YIG film. Our nanocontact approach thus offers an alternative route in the search for auto-oscillations in YIG films.

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