Analysis of thermal critical curves in temperature and time dependent Preisach type models

Abstract

The shape and the movement of the critical curves in the Preisach plane are investigated using the numerical solution of master equation with variable magnetic field and temperature. It is shown that the shape of the thermal critical curve is a curve line. The movement of the thermal boundaries is simulated in magnetization processes with constant or variable field. Using this model we can explain the dependence of the coercivity on the variation rate of the magnetic field.