Title :
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.
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 Ni100-x Cox 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;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2006.878813
