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
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.
