A rigorous treatment of the giant magnetoimpedance (GMI) in soft magnetic wires is presented. A small-signal approximation is used for a cylindrical magnetic conductor which is saturated along its axis by a static magnetic field. The general analysis of GMI includes a discussion of the influence of different parameters on the GMI and of how the calculation can be extended to nonsaturating fields. The comparison with high frequency impedance spectra of CoFeSiB wires measured with a network analyzer, including the observation of the ferromagnetic resonance peaks, confirms that the proposed model gives a satisfactory explanation for the linear GMI effect over a broad frequency range and opens the way to more refined calculations.

Giant microwave magnetoimpedance in a single crystal of La0.7Sr0.3MnO3: The effect of ferromagnetic antiresonance Locally resolved photothermally modulated ferromagnetic resonance investigation of magnetic anisotropies in a (001)Fe wedge film

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