Kinetic effects observed in dynamic first-order reversal curves of magnetic wires: Experiment and theoretical description

Abstract

This study is focused on the possibility to extend the use of the first-order reversal curve (FORC) diagram method to rate-dependent hysteresis observed experimentally on soft magnetic wires. The FORC system of an amorphous magnetic wire was measured with an inductometric experimental setup in which the field-rate was maintained constant. The FORC experiment was performed for four different field-rates. We have developed and implemented a model based on the hypothesis that the magnetization processes in the samples are mainly due to the movement of a domain wall between the central domains of the wire. The differential equation of the domain wall movement is able to give a remarkably accurate description of the experimental FORC diagrams for all the field rates used in the experiment. The experimental FORCs, the FORC susceptibility diagram, and the classical FORC diagram show, however, a number of details that the model is not able to describe. In each such case, one discusses the possible physical cause of the observed behavior.