3D-simulations of magnetic structures in af-coupled multilayers with pinholes

For antiferromagnetically (af) coupled Py (Ni81Fe19\Cu)-multilayers lattice calculations have been used already for the investigation of pinholes in G MR elements. The very thin spacer layer (< 10 Angstrom) is sensitive agains t pinholes as a link between the magnetic layers. Additional coupling throu gh the pinhole modifies drastically the af-coupling between the magnetic la yers and leads to strong changes in the M(H) and Delta R/R(H) curves. Impro ved lattice calculations with large grids offer the opportunity, to study e ffects of geometry in layers structured laterally. (C) 2000 American Instit ute of Physics. [S0021-8979(00)86608-6].