Frequency dependence of coercivity and initial permeability in ferromagnetic metallic glasses

Abstract

Coercivity Hc( f ) and initial permeability χi( f ) of two kinds of ferromagnetic glasses, 2605S2 and VAC6030, have been measured as a function of frequency from 4 Hz to 2 kHz. Field annealing and stretching of samples have been used to define an easy axis along the longitudinal direction. Some samples were thinned to see the thickness effect. We have analyzed the f dependence of coercivity and initial permeability based on the wall pinning model.