Magnetoelastic coupling in BaTiO3-based multiferroic structures

TL;DR

This paper derives analytical expressions for magnetoelastic anisotropy in cubic magnetic systems on BaTiO3 substrates, explaining temperature-dependent magnetic behavior due to strain from phase transitions, aiding design of magnetoelectric heterostructures.

Contribution

It provides new analytical formulas for magnetoelastic anisotropy constants considering substrate-induced distortions in BaTiO3-based structures.

Findings

Quantifies strain-induced magnetic anisotropies in BaTiO3 heterostructures.

Explains temperature-dependent magnetic property variations.

Aligns theoretical results with experimental observations.

Abstract

Analytical expressions for the magnetoelastic anisotropy constants of cubic magnetic systems are derived for rectangular and oblique distortions originating from epitaxial growth on substrates with lower crystal symmetry. In particular, the temperature variation of the magnetic properties of magnetic films grown on barium titanate (BaTiO3) substrates are explained in terms of strain-induced magnetic anisotropies caused by the temperature dependent phase transitions of BaTiO3. Our results quantify the experimental observations in ferromagnet/\bto-based structures, which have been proposed as templates for magnetoelectric composite heterostructures.