Efficient deperming protocols based on the magnetic properties in demagnetization process

Recently, hard magnetic materials with strong coercivity force and large squareness ratio have been developed and widely exhausted in the various application fields. Also, soft magnetic materials which used for generating high magnetic flux have been developed in electron and telecommunication engineering area. In order to apply these ferromagnetic materials to electronic and electrical machines, magnetization and demagnetization techniques are important based on the precise ferromagnetic material´s modeling. Especially in the national defense and security field, efficient and reliable deperming scheme, e.g. demagnetization of underwater magnetic field by warship in order not to be revealed from mine, torpedo, and anti-submarine aircraft, is required. In this paper, efficient deperming protocol is researched reflecting ferromagnetic material´s properties. In order to calculate interior magnetization of ferromagnetic material according to demagnetization process, Preisach modeling is combined with finite elements method (FEM) and it is verified by laboratory magnetic treatment facility (MTF) experiments. Finally, this research conducted analysis between hysteresis curve and its deperming performance based on Preisach model, and proposed newly introduced deperming protocol as reflective of ferromagnetic material´s properties.