Influence of temperature and magnetizing field on the magnetic permeability of soft ferrite materials

Abstract

Soft ferrite materials are commonly used as magnetic cores of inductive components utilized in electronic industry. Magnetic B-H characteristics of ferrites exhibit strong temperature dependence. It is connected with changes of magnetic permeability of ferrite material subjected to different temperatures. In ferromagnetic materials, also ferrites, magnetic permeability depends on the value of magnetizing field. In this paper, results of investigation on the influence of temperature and magnetizing field on the magnetic permeability of soft ferrite materials are presented. Several ring shaped cores made of different manganese-zinc ferrites were investigated on developed test stand utilizing cryostat to set the temperature in the range form −20 °C to 60 °C. Obtained results indicate that there is a strong correlation between temperature of ferrite material and its magnetic permeability, which cannot be neglected in technical applications of ferrite magnetic cores.