Compositional Dependence of g-Factor and Damping Constant of GdFeCo Amorphous Alloy Films

• Kato T.

• 加藤 剛志

• Nakazawa K.

• Komiya R.

• Nishizawa N.

• Tsunashima S.

• Iwata S.

書誌事項

タイトル別名

• Compositional dependence of g-factor and damping constant of GdFeCo amorphous alloy films

抄録

Time-domain magnetization dynamics of sputtered GdFeCo (30 nm) amorphous alloy films was measured by pump-probe method using high-power ultra-short pulse fiber laser. The effective g-factor $g_{\rm eff}$ and effective damping constant $α_{\rm eff}$ of the GdFeCo films were estimated by using a numerical calculation of Landau–Lifshitz–Gilbert equation. The precessional frequency took a maximum near the magnetization compensation composition $C_{\rm M}$ of the GdFeCo, while the estimated $g_{\rm eff}$ and $α_{\rm eff}$ increased around the angular momentum compensation composition $C_{\rm A}$. The compositional dependences of $g_{\rm eff}$ and $α_{\rm eff}$ were roughly described by a mean-field model. The $g_{\rm eff}$ and $α_{\rm eff}$ were also estimated from the ferromagnetic resonance (FMR) spectra, and the data from the FMR spectra agreed well with those from the pump-probe measurement except for the composition near $C_{\rm M}$. The FMR method was unable to excite the magnetization near $C_{\rm M}$ because of the small net magnetization.

収録刊行物

• IEEE Transactions on Magnetics

  IEEE Transactions on Magnetics 44 (11), 3380-3383, 2008-11

  IEEE

キーワード

• Amorphous magnetic films
• magnetic resonance
• optical fiber lasers
• rare earth alloys
• time domain analysis

詳細情報

• CRID: 1574231877248228736
• NII論文ID: 120001101533
• ISSN: 00189464
• Web Site: http://hdl.handle.net/2237/11190
• 本文言語コード: en
• データソース種別:
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