RESEARCH ON STRUCTURE AND MAGNETIC PROPERTIES OF EXPITAXIALLY GROWN MAGNETIC FILMS

摘要

Three major areas have been investigated under the contract during the period.n1. An investigation of the role of Imperfections In magnetic’ thin filma:'ha6 been conducted and a strong emphasis In this effort has been placed upon epitaxial properties. The results include an evaluation of voids in aged single crystals, an analybls of face-centered-cubic single crystal cobalt films and an Investigation of "ripple" as related to crystallographic properties of the epitaxial films.n2. A program to investigate the properties and origin of strip domains in various Knife thin films vas initiated. Methods for observing these domains were perfected and properties evaluated as a function of film fabrication parameters.n3. A large uniaxial anisotropy has been observed In Knife films deposited on single crystal quartz substrates. Subsequent investigation show that its origin is a substrate-film constraint mechanism related to the planar strain system developed because of a difference in coefficient s of the thermal expansion of the quartz and Knife film.