Magnetization processes in amorphous R-Co/R′-Co/R-Co sandwiches (R, R′=Y, Nd, Gd, Er)

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Abstract
Sandwiches consisting of three amorphous layers (R0.33,Co0.67)1000 Å/ R′0.33,Co0.67)1000 Å/ (R0.33Co0.67)1000 Å, have been prepared by dc triode sputtering (R, R′ are rare-earth elements). The systems chosen are such that the bulk magnetization alternates from one layer to the next or the coercivity of each layer is significantly different. Magnetic transitions are observed under field. They have been quantitatively analyzed in terms of successive reversals of magnetization in the different layers. The creation or annihilation of planar Bloch walls parallel to the surface are associated with the magnetic transitions. The wall energy and wall width depend essentially on the competition between exchange energy and Zeeman energy. It is suggested that the existence of such Bloch walls may favor magnetization reversal in thin films by coherent processes.

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