Magnetostatic wall interaction effects in multilayer films

The critical film thickness for Bloch-Néel (B-N) wall-type transition has previously been determined experimentally for the configuration of two parallel and equally thick 81 percent Ni-19 percent Fe films separated by a nonferromagnetic layer of SiO as a function of the thickness of the separating layer. The experimental results are interpreted assuming a simple coupled-wall model and using the Néel approximation for wall width and wall energy calculations.