Magnetisation depth profiles in trilayer systems with mixed–spin interfaces—a contribution to temperature dependent GMR-potentials

We discuss the magnetic properties of trilayer A(n)/AcB 1-c/B(p)/AcB1-c/A′(m)-structure with two mixed-spin interfaces AcB1-c (SA=1, S B=1/2) for arbitrary concentration c of A-spins and varied partial film thickness (n,p,m). The description is obtained by means of an effective-field approach which is superior to the standard molecular-field treatment. Temperature dependent magnetisation depth profiles of trilayer structure vs. concentration c of A-atoms are presented in the whole range of reduced temperature. The existence of enhanced interface magnetism is also discussed using the phase diagrams in JAB-c plane. Depth profiles are strongly inhomogeneous in the interface region and thus they lead to complex interface potentials contributing significantly to GMR-effect. © 2003 Elsevier B.V. All rights reserved.