Frequency dependence of the ferromagnetic resonance width in magneto-impedance measurements

[摘要] Giant magneto-impedance has shown large sensitivities that are of great interest in practical applications. Above certain frequencies the ferromagnetic resonance controls the magneto-impedance behavior, and the resonance width limits the maximum achievable magneto-impedance ratio. In this work we present the evolution of the resonance width as a function of the frequency, determined through magneto-impedance and microwave absorption measurements on a NiFe-Au multilayer thin film. The width of the resonance can be fitted to a curve in the form of Delta f similar to f(-1). This is explained by means of a simple model taking into account all inhomogeneities in the sample through a Gaussian distribution of anisotropy fields, as suggested by the shape of the hysteresis loop. (C) 2008 Elsevier B.V. All rights reserved.

[发布日期] 2008-10-01

[效力级别]  Proceedings Paper

[关键词] magneto-impedance;ferromagnetic resonance;anisotropy distribution