A variation in the magnetization and magnetic domain structures of epitaxial Fe dots on a single crystal BaTiO_3 substrate is demonstrated in association with the structural phase transition of ferroelectric BaTiO_3. The temperature dependent magnetization of Fe dots drops suddenly at 282 K and increases again at 189 K with decreasing temperature. The variations clearly correspond to the successive structural phase transitions of BaTiO_3 from tetragonal to orthorhombic phases and from orthorhombic to rhombohedral phases. After a thermal cycle between room temperature and 150 K passing through these phase transitions, the initial magnetic domain structure of Fe dots with an enclosed magnetic flux structure changes to a single-domain-like structure due to interfacial strain between Fe and BaTiO_3 arising from possible switching of c-axis orientation of BaTiO_3 substrate.
展开▼
