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Antidamping spin-orbit torques in epitaxial-Py(100)/beta-Ta

Journal article
Authors D. Tiwari
N. Behera
A. Kumar
Philipp Dürrenfeld
S. Chaudhary
D. K. Pandya
Johan Åkerman
P. K. Muduli
Published in Applied Physics Letters
Volume 111
Issue 23
ISSN 0003-6951
Publication year 2017
Published at Department of Physics (GU)
Language en
Links doi.org/10.1063/1.5007202
Keywords oscillator driven, nano-oscillator, system, layer, Physics
Subject categories Physical Sciences

Abstract

We perform spin torque ferromagnetic resonance measurements on the Si(100)/TiN(100)/epi-Py(100)/beta-Ta system. We demonstrate current induced modulation of the Gilbert damping constant, which is about 30% for a current density of 6.25 x 10(9) A/m(2). We show that the observed modulation of the Gilbert damping constant cannot be explained by spin transfer torques arising from the spin Hall effect of the beta-Ta layer. An additional mechanism such as antidamping spinorbit torque resulting from the interface or the crystalline structure of Py thin films needs to be considered. Published by AIP Publishing.

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