PROGRES ET PERSPECTIVES
J. Phys. IV France 02 (1992) C3-147-C3-157
Epitaxie de phases métastables de ferS. ANDRIEU1, M. PIECUCH1, J.F. BOBO1, O. LENOBLE1 and Ph. BAUER2
1 Laboratoire Mixte, CNRS-St Gobain, BP. 109, 54704 Pont à Mousson, France
2 Laboratoire de Physique des Solides, Univ. Nancy I, BP. 239, 54506 Vandoeuvre, France
In this paper, Fe structures and magnetic properties in FeRu and FeIr superlattices are presented. Fe is grown on hexagonal surface lattices as Ru(0001), Ir (111), but also on rectangular or square ones as Ru (1122), and Ir (100). On hexagonal lattices, the beginning of the growth is pseudomorphic in the plane of growth but Fe relaxes in its strain bcc phase via Kurdjumov-Sachs (KS) coïncidence. The pseudomorphic phase is shown to be non-magnetic at room temperature, as a moment appears when relaxation occurs. In FeRu (1122) superlattices, no KS relaxation occurs, and again 10 non-magnetic layers are observed. On the contrary, a small moment is observed for thin Fe layers on FeIr (100) superlattices. Fe is thus synthesized with body centered tetragonal structures with a c/a ratio varying from 1,26 to 1 (bcc). A rotation of the easy axis of magnetization as well as an increase of the magnetic moment is observed from out to in plane.
© EDP Sciences 1992