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

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:320

Article; Proceedings Paper

de Cos, D.¹  Garcia-Arribas, A.¹  Barandiaran, J. M.¹ 

[1] Univ Basque Country, Dept Elect & Elect, Fac Ciencias & Tecnol, E-48080 Bilbao, Spain

关键词: magneto-impedance;    ferromagnetic resonance;    anisotropy distribution;   

DOI  :  10.1016/j.jmmm.2008.04.002

来源: Elsevier

【 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.

【 授权许可】

Free