Magnetization behavior of soft magnetic materials for sensor applications

摘要

This paper presents a magnetic characterization technique based on the analysis of respective magnetization curves of the soft ferrites materials under test. The magnetic properties in low external magnetic field are explored for those materials. The method applies an alternating electric current through the coil to magnetize the ferromagnetic materials used as a core. Due to the change in current, the changes in the primary coil result in changing the magnetic field and the magnetic flux. An op-amp acting as a voltage integrator is used in the circuit, connected to the secondary winding. Several experiments were conducted to obtain desired hysteresis loops. These results show the changes due to variation of magnetism; hence one can decide on the comparative values of magnetic parameters for each sample tested. Moreover, the obtained hysteresis loops are evaluated to be comfortably used for the application in magneto resistive applications, magneto-resistive sensors and for a wide range of biomedical equipment items.