AB-INITIO STUDY OF THE INFLUENCE OF EPITAXIAL STRAIN ON MAGNETOELASTIC PROPERTIES

摘要

Epitaxial magnetic films are interesting from the technological point of view because they represent a basis for magnetorecording devices, magnetic sensors and magnetoresistive random access memories. The physical properties of the magnetic films differ quite significantly from the properties of the respective bulk materials. For films with thickness larger than say 10 nm, the reason for these differences is mainly ascribed to the epitaxial strain due to the mismatch between the film and substrate lattice parameters. We interpret the experimental data by applying the general phenomenological nonlinear theory of magnetoelasticity and prove our hypothesis by calculating first- and second-order magnetoelastic coupling coefficients within the framework of the ab initio density functional theory.