Magnetic Damping in Ferromagnetic Thin Films
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概要
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We determined the Gilbert damping constants of Fe–Co–Ni and Co–Fe–B alloys with various compositions and half-metallic Co2MnAl Heusler alloy films prepared by magnetron sputtering. The ferromagnetic resonance (FMR) technique was used to determine the damping constants of the prepared films. The out-of-plane angular dependences of the resonance field ($H_{\text{R}}$) and line width ($\Delta H_{\text{pp}}$) of FMR spectra were measured and fitted using the Landau–Lifshitz–Gilbert (LLG) equation. The experimental results fitted well, considering the inhomogeneities of the films in the fitting. The damping constants of the metallic films were much larger than those of bulk ferrimagnetic insulators and were roughly proportional to $(g-2)^{2}$, where $g$ is the Lande $g$ factor. We discuss the origin of magnetic damping, considering spin–orbit and s–d interactions.
- 2006-05-15
著者
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Oogane Mikihiko
Department Of Applied Physics Graduate School Of Engineering Tohoku University
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Ando Yasuo
Department Of Applied Physics Graduate School Of Engineering Tohoku University
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Sakuma Akimasa
Department Of Applied Physics Graduate School Of Engineering Tohoku University
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Yakata Satoshi
Department Of Applied Physics Graduate School Of Engineering Tohoku University
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Miyazaki Terunobu
Department Of Applied Physics Faculty Of Engineering Tohoku University
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Yilgin Resul
Department Of Applied Physics Graduate School Of Engineering Tohoku University
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Sakuma Akimasa
Department of Applied Physics, Graduate School of Engineering, Tohoku University, Aoba-yama 05, Sendai 980-8579, Japan
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Wakitani Takeshi
Department of Applied Physics, Graduate School of Engineering, Tohoku University, Aoba-yama 05, Sendai 980-8579, Japan
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Yilgin Resul
Department of Applied Physics, Graduate School of Engineering, Tohoku University, Aoba-yama 05, Sendai 980-8579, Japan
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Yakata Satoshi
Department of Applied Physics, Graduate School of Engineering, Tohoku University, Aoba-yama 05, Sendai 980-8579, Japan
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Miyazaki Terunobu
Department of Applied Physics, Graduate School of Engineering, Tohoku University, Aoba-yama 05, Sendai 980-8579, Japan
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