Effective permeability taking account of demagnetization factor is widely used in the field of the magnetic engineering. A development of this effective permeability to complex permeability in the high frequency domain is studied. In comparison with the solution of LLG equation, it shows that the permeability in the low frequency domain and the resonance frequency calculated by using demagnetization factor are almost corresponding to those calculated by LLG equation. However, the good agreement is not seen in the resonance absorption peak width. Furthermore, the measured complex permeability of a Ni-Fe film is compared with the calculations by using demagnetization factor.
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