SOLUTION OF MAGNETIC HEAD FIELD PROBLEMS USING THE BEM

At ISEF'89 we spoke about our work concerning two dimensional (2D) modelling of magnetic heads. Starting with the magnetostatic transmission problem for a magnetic domain with finite permeability ? we derived an integral formulation for the scalar potential which was treated using the Boundary Element Method (BEM). By discretising the boundary only, one can get the potential and the magnetic field in each point of the plane. Further calculations yield the efficiency and the response of the head. These investigations resulted in our system BEA86 which can be used on a PC interactively for designing integrated magnetic heads. Next step was to realise the method described above in the 3D case. But of course this was not possible on a PC. Even on a Micro VAX it took more than one hour to solve a head problem including field and efficiency calculation with our system BOASPM. So our idea was to simulate the 3D‐behaviour of a magnetic head in a more simple way (see Fig. 1 to compare the three models).