J. Phys. Colloques
Volume 49, Numéro C8, Décembre 1988Proceedings of the International Conference on Magnetism
|Page(s)||C8-1709 - C8-1710|
J. Phys. Colloques 49 (1988) C8-1709-C8-1710
THICKNESS DEPENDENCE OF MAGNETIZATION AND MAGNETOSTRICTION OF NiFe AND NiFeRh FILMSK. Ounadjela1, H. Lefakis1, V. S. Speriosu1, C. Hwang2 et P. S. Alexopoulos1
1 Magnetic Recording Institute
2 IBM General Products Division, San Jose, Ca, U.S.A.
The saturation magnetization, 4πMs, and the magnetostriction constant, λ, of Ni81Fe19, Ni81Fe19/Ta and Ni72Fe17Rh11/ Ta thinfilms were studied as a function of film thickness before and after annealing. For films of thickness t < 200 Å, 4πMs, and λs were found to be strongly dependent on film thickness with even larger variation after annealing. Auger depth profiles have shown the existence of inhomogeneous interfacial layer at the film surface, Ta/film and film/substrate interfaces. The presence of such layers of different composition and magnetic properties from the film bulk, can explain the observed behavior of 4πMs and λs.