Effect of interface magnetization depinning on the frequency shift of ferromagnetic and spin wave resonance in YIG/GGG films

doi:10.1088/1674-1056/ab8dac

Abstract Nowadays the yttrium iron garnet (Y₃Fe₅O₁₂, YIG) films are widely used in the microwave and spin wave devices due to their low damping constant and long propagation distance for spin waves. However, the performances, especially the frequency stability, are seriously affected by the relaxation of the interface magnetic moments. In this study, the effect of out-of-plane magnetization depinning on the resonance frequency shift (Δf_r) was investigated for 3-μm YIG films grown on Gd₃Ga₅O₁₂ (GGG) (111) substrates by liquid-phase epitaxy. It is revealed that the ferromagnetic resonance (FMR) and spin wave propagation exhibit a very slow relaxation with relaxation time τ even longer than one hour under an out-of-plane external magnetic bias field. The Δf_r span of 15.15-24.70 MHz is observed in out-of-plane FMR and forward volume spin waves. Moreover, the Δf_r and τ depend on the magnetic field. The Δf_r can be attributed to that the magnetic moments break away from the pinning layer at the YIG/GGG interface. The thickness of the pinning layer is estimated to be about 9.48 nm to 15.46 nm according to the frequency shifting. These results indicate that Δf_r caused by the pinning layer should be addressed in the design of microwave and spin wave devices, especially in the transverse magnetic components.

Keywords: yttrium iron garnet (YIG) magnetization relaxation ferromagnetic resonance spin waves

Received: 30 March 2020
Revised: 22 April 2020
Accepted manuscript online:

PACS:	76.50.+g	(Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance)
	85.70.Ge	(Ferrite and garnet devices)
	75.10.Hk	(Classical spin models)
	75.25.-j	(Spin arrangements in magnetically ordered materials (including neutron And spin-polarized electron studies, synchrotron-source x-ray scattering, etc.))

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11674187 and 51871127) and Technology on Electronic Test & Measurement Laboratory (Grant No. 6142001180103).

Corresponding Authors: Shandong Li
E-mail: lishd@qdu.edu.cn

Cite this article:

Fanqing Lin(林凡庆), Shouheng Zhang(张守珩), Guoxia Zhao(赵国霞), Hongfei Li(李洪飞), Weihua Zong(宗卫华), Shandong Li(李山东) Effect of interface magnetization depinning on the frequency shift of ferromagnetic and spin wave resonance in YIG/GGG films 2020 Chin. Phys. B 29 067601

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Effect of interface magnetization depinning on the frequency shift of ferromagnetic and spin wave resonance in YIG/GGG films

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