Intrinsic Gilbert damping constant in Co2MnAl Heusler alloy films

Resul Yilgin; Mikihiko Oogane; Stoshi Yakata; Yasuo Ando; Terunobu Miyazaki

doi:10.1109/TMAG.2005.854832

Intrinsic Gilbert damping constant in Co₂MnAl Heusler alloy films

Resul Yilgin, Mikihiko Oogane, Stoshi Yakata, Yasuo Ando, Terunobu Miyazaki

ENG - Applied Physics

Research output: Contribution to journal › Article › peer-review

33 Citations (Scopus)

Abstract

Intrinsic α-damping constants of Co₂MnAl Heusler alloy films prepared by magnetron sputtering were investigated. After deposition of Co₂MnAl films, the films were annealed at 200-400°C to control the crystal structure and the atomic order between Co, Mn, and Al sites. Ferromagnetic resonance (FMR) technique was used to obtain α values of Co₂MnAl films in this study. Out-of-plane angular dependences of the resonance field (H_R) and line width (ΔH_pp) of FMR spectra were measured and fitted using the Landau-Lifshitz-Gilbert (LLG) equation. The authors were able to fit all experimental results well because of the lack of inhomogeneities in prepared Co₂MnAl films. The α-damping constants obtained from the fitting results decreased with increasing annealing temperature and showed a minimum value of 0.007 at 300°C. It was found that a degree of B2 structure order can sensitively affect α-damping constants of Co₂MnAl films.

Original language	English
Pages (from-to)	2799-2801
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	41
Issue number	10
DOIs	https://doi.org/10.1109/TMAG.2005.854832
Publication status	Published - 2005 Oct

Keywords

Ferromagnetic resonance (FMR)
Heusler alloy
Linewidth
Resonance field
α-Gilbert damping constant

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

Access to Document

10.1109/TMAG.2005.854832

Cite this

@article{d04ba66ac7a74bb08399d7cadfed1007,

title = "Intrinsic Gilbert damping constant in Co2MnAl Heusler alloy films",

abstract = "Intrinsic α-damping constants of Co2MnAl Heusler alloy films prepared by magnetron sputtering were investigated. After deposition of Co2MnAl films, the films were annealed at 200-400°C to control the crystal structure and the atomic order between Co, Mn, and Al sites. Ferromagnetic resonance (FMR) technique was used to obtain α values of Co2MnAl films in this study. Out-of-plane angular dependences of the resonance field (HR) and line width (ΔHpp) of FMR spectra were measured and fitted using the Landau-Lifshitz-Gilbert (LLG) equation. The authors were able to fit all experimental results well because of the lack of inhomogeneities in prepared Co2MnAl films. The α-damping constants obtained from the fitting results decreased with increasing annealing temperature and showed a minimum value of 0.007 at 300°C. It was found that a degree of B2 structure order can sensitively affect α-damping constants of Co2MnAl films.",

keywords = "Ferromagnetic resonance (FMR), Heusler alloy, Linewidth, Resonance field, α-Gilbert damping constant",

author = "Resul Yilgin and Mikihiko Oogane and Stoshi Yakata and Yasuo Ando and Terunobu Miyazaki",

note = "Funding Information: This work was supported by the IT-program of Research Revolution 2002 (RR2002) “Development of Universal Low-Power Spin Memory,” Grants-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan, and the NEDO Grant Program.",

year = "2005",

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language = "English",

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journal = "IEEE Transactions on Magnetics",

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TY - JOUR

T1 - Intrinsic Gilbert damping constant in Co2MnAl Heusler alloy films

AU - Yilgin, Resul

AU - Oogane, Mikihiko

AU - Yakata, Stoshi

AU - Ando, Yasuo

AU - Miyazaki, Terunobu

N1 - Funding Information: This work was supported by the IT-program of Research Revolution 2002 (RR2002) “Development of Universal Low-Power Spin Memory,” Grants-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan, and the NEDO Grant Program.

PY - 2005/10

Y1 - 2005/10

N2 - Intrinsic α-damping constants of Co2MnAl Heusler alloy films prepared by magnetron sputtering were investigated. After deposition of Co2MnAl films, the films were annealed at 200-400°C to control the crystal structure and the atomic order between Co, Mn, and Al sites. Ferromagnetic resonance (FMR) technique was used to obtain α values of Co2MnAl films in this study. Out-of-plane angular dependences of the resonance field (HR) and line width (ΔHpp) of FMR spectra were measured and fitted using the Landau-Lifshitz-Gilbert (LLG) equation. The authors were able to fit all experimental results well because of the lack of inhomogeneities in prepared Co2MnAl films. The α-damping constants obtained from the fitting results decreased with increasing annealing temperature and showed a minimum value of 0.007 at 300°C. It was found that a degree of B2 structure order can sensitively affect α-damping constants of Co2MnAl films.

AB - Intrinsic α-damping constants of Co2MnAl Heusler alloy films prepared by magnetron sputtering were investigated. After deposition of Co2MnAl films, the films were annealed at 200-400°C to control the crystal structure and the atomic order between Co, Mn, and Al sites. Ferromagnetic resonance (FMR) technique was used to obtain α values of Co2MnAl films in this study. Out-of-plane angular dependences of the resonance field (HR) and line width (ΔHpp) of FMR spectra were measured and fitted using the Landau-Lifshitz-Gilbert (LLG) equation. The authors were able to fit all experimental results well because of the lack of inhomogeneities in prepared Co2MnAl films. The α-damping constants obtained from the fitting results decreased with increasing annealing temperature and showed a minimum value of 0.007 at 300°C. It was found that a degree of B2 structure order can sensitively affect α-damping constants of Co2MnAl films.

KW - Ferromagnetic resonance (FMR)

KW - Heusler alloy

KW - Linewidth

KW - Resonance field

KW - α-Gilbert damping constant

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