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Theoretical investigation of magnetization configurations and reversal processes is presented in exchange-coupled double layer (ECDL) and trilayer (ECTL) with mixed parallel and perpendicular anisotropy structures (F1/F2) and (F2/F1/F2) where F1 is a planar magnetization film corresponding to binary NdCo or ternary GdFeCo amorphous alloy and F2 is a perpendicular magnetization film such as DyFeCo alloy. It is shown from the analytical study that the magnetic profiles are strongly dependent on the magnetic parameters of the layers F1 and F2, the films thickness and the external field along the normal to the film plane which gives the possibility to investigate the magnetization reversal in the multilayers. Calculations are derived in ECDL from a variational method of the magnetic energies in a continuous model and in ECTL from a noncontinuous model. The magnetization profiles and reversal processes are analyzed from an effective exchange induced inside the perpendicular layer F2 by the capping planar layer F1.

THEORETICAL STUDY OF MAGNETIZATION PROFILES AND PROCESSES IN EXCHANGE-COUPLED DOUBLE AND TRILAYERS