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Thickness-and temperature-dependent magnetodynamic properties of yttrium iron garnet thin films

Journal article
Authors Mohammad Haidar
Mojtaba Ranjbar
Michael Balinsky
Randy K. Dumas
S. Khartsev
Johan Åkerman
Published in Journal of Applied Physics
Volume 117
Issue 17
Pages artikel nr 17D119
ISSN 0021-8979
Publication year 2015
Published at Department of Physics (GU)
Pages artikel nr 17D119
Language en
Links dx.doi.org/10.1063/1.4914363
https://gup.ub.gu.se/file/190890
Keywords SPIN-LATTICE-RELAXATION, FERROMAGNETIC RELAXATION, FERRIMAGNETIC, RESONANCE, Physics, Applied
Subject categories Physical Sciences

Abstract

The magnetodynamical properties of nanometer-thick yttrium iron garnet films are studied using ferromagnetic resonance as a function of temperature. The films were grown on gadolinium gallium garnet substrates by pulsed laser deposition. First, we found that the damping coefficient increases as the temperature increases for different film thicknesses. Second, we found two different dependencies of the damping on film thickness: at room temperature, the damping coefficient increases as the film thickness decreases, while at T = 8K, we find the damping to depend only weakly on the thickness. We attribute this behavior to an enhancement of the relaxation of the magnetization by impurities or defects at the surfaces. (c) 2015 AIP Publishing LLC.

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