Damping Constants of Ni-Fe and Ni-Co Alloy Thin Films

Author

Inaba, Nobuyuki ; Asanuma, Hironori ; Igarashi, Satoshi ; Mori, Shunnsuke ; Kirino, Fumiyoshi ; Koike, Kunihiro ; Morita, Hiroaki

Author_Institution

Dept. of Electr. Eng., Yamagata Univ.

Volume

42

Issue

10

fYear

2006

Firstpage

2372

Lastpage

2374

Abstract

Gilbert´s damping constants, alpha, of Ni-Fe and Ni-Co thin films are determined by Q-band ferromagnetic resonance (FMR) analysis. alpha is calculated from the resonance width of the FMR spectrum. alpha of Ni₈₅ Fe₁₅ film is found to be 0.0034, which is one-fourth of those of Ni film (alpha=0.013) and Co (alpha=0.013). alpha of the Ni_100-x Co_x specimens increases with decreasing the Co concentration from 100 to 68 at%, and the alpha value of Ni₃₂ Co₆₈ film has the maximum value of 0.0021. The alpha values of the Ni-Co specimens are nearly the same as those of the Co-Cr-Ta and the Co-Cr-Pt

Keywords

cobalt alloys; damping; ferromagnetic resonance; iron alloys; magnetic thin films; nickel alloys; CoCrPt; CoCrTa; FMR analysis; FMR spectrum; Gilbert damping constants; NiCo; NiFe; Q-band ferromagnetic resonance analysis; Damping; Iron; Magnetic analysis; Magnetic field measurement; Magnetic films; Magnetic resonance; Perpendicular magnetic recording; Saturation magnetization; Soft magnetic materials; Transistors; Damping constant; Ni-Co alloy thin film; Ni-Fe alloy thin film; ferromagnetic resonance;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2006.878813

Filename

1704303