OBSERVATION AND COMPUTER-SIMULATION OF MAGNETIZATION PROCESSES IN EXCHANGE-COUPLED SM-CO CO-ZR/SM-CO' SANDWICHES/

In a Sm-Co/Co-Zr/Sm-Co' sandwich system consisting of two magnetically hard external layers with different coercivities and of a soft centra l layer, a configuration can be stabilized with the magnetic moments o f the Sm-Co layers pointing in opposite directions. In this state, the magnetization processes in the central layer are nearly reversible an d the susceptibility is found to depend on the layer thickness. This b ehaviour can be understood in terms of the formation of a mobile Bloch wall in the central layer and has been simulated numerically by means of a simple one-dimensional model.