Temperature dependence of spin-wave modes and Gilbert damping in lanthanum-doped yttrium-iron-garnet films

Lichuan Jin; Yuele Wang; Guangduo Lu; Jialu Li; Yujie He; Zhiyong Zhong; Huaiwu Zhang

doi:10.1063/1.5085922

AIP Advances (Feb 2019)

Temperature dependence of spin-wave modes and Gilbert damping in lanthanum-doped yttrium-iron-garnet films

Lichuan Jin,
Yuele Wang,
Guangduo Lu,
Jialu Li,
Yujie He,
Zhiyong Zhong,
Huaiwu Zhang

Affiliations

Lichuan Jin: State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, People’s Republic of China
Yuele Wang: State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, People’s Republic of China
Guangduo Lu: College of Science, Research Institute for Magnetoelectronics and Weak Magnetic-field Detection, China Three Gorges University, Yichang 443002, People’s Republic of China
Jialu Li: State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, People’s Republic of China
Yujie He: State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, People’s Republic of China
Zhiyong Zhong: State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, People’s Republic of China
Huaiwu Zhang: State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, People’s Republic of China

DOI: https://doi.org/10.1063/1.5085922
Journal volume & issue: Vol. 9, no. 2
pp. 025301 – 025301-6

Abstract

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In this work, we study the ferromagnetic resonance (FMR) spectra of lanthanum-doped yttrium-iron-garnet (La:YIG) film as a function of temperature and frequency. The experimental results show a significant increase in the number of spin-wave resonance modes with increasing temperature. The FMR linewidth is nonlinear as a function of frequency at low temperatures but linear at room temperature. This nonlinear behavior at low temperature indicates the relaxation of the magnetization by impurities (La3+ dopant) or defects at the surfaces. Most importantly, the results reveal that temperature-dependent Gilbert damping in La:YIG film originates from two-magnon scattering, whereas the enhanced Gilbert damping at low-temperature (≤100K) is due mainly to spin-lattice relaxation of La3+ dopants.

Published in AIP Advances

ISSN: 2158-3226 (Online)
Publisher: AIP Publishing LLC
Country of publisher: United States
LCC subjects: Science: Physics
Website: http://aipadvances.aip.org/

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