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

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7 Author(s)
N. Inaba ; Dept. of Electr. Eng., Yamagata Univ. ; H. Asanuma ; S. Igarashi ; S. Mori
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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

Published in:

IEEE Transactions on Magnetics  (Volume:42 ,  Issue: 10 )