Analysis Interaction Field Strength and Spectrum from Microhysteresis Loops

Abstract

In this paper, we present a direct method to analyze the mechanism of magnetic domain reversal for a series of amorphous Dy x (FeCo) 1-x magnetic thin films and whereby we obtained the distributions of the coercivities and interaction fields from 90,000 measurements of the microhysteresis loops. The standard deviations of the coercivity and the interaction field distributions, σ i and σ k, can be estimated by fitting the experimental data with the Gaussian-Preisach function. The results show that the interaction field decreases as Dy composition approaches the compensation point. The reversal mechanism is dominated by nucleation when σ i is smaller than σ k . The relationships between the magnetization reversal and interaction field strength are discussed.