PROCEDIMENTO PER OTTENERE,IN FILMSEPITASSIALE DI GRANATI MAGNETICI, STRATI AVENTI DIVERSE PROPRIETA' DI ANISOTROPIA MAGNETICA

摘要

A process for obtaining layers of different magnetic anisotropy properties in epitaxial films of magnetic garnets, in which process the film is subjected to a reducing treatment with the formation of parallel layers with different lattice parameters, between which layers a difference occurs in the orientation of the axis of spontaneous magnetization as a result of the magnetostriction effect. More particularly, by carrying out an annealing treatment in hydrogen on a garnet film having a positive magnetostriction constant the formation is obtained of a lower layer with spontaneous magnetization perpendicular to the film plane as well as of a surface layer whose spontaneous magnetization lies in the plane. Such structure can be directly applied to the production of magnetic bubble memories.