Substrate Dependent Structure and Magnetic Properties in $\hbox {HoMnO}_{3}$ Films

The HoMnO₃ films with different crystalline structure are synthesized on various substrates by pulsed laser deposition. The crystalline orientation of HoMnO₃ films is strongly dependent on the substrate. It is found that the pure hexagonal and orthorhombic HoMnO₃ films can be grown on the Y₂O₃:ZrO₂(111) and LaAlO₃(110) substrates, respectively. Based on the results of temperature dependent magnetizations M(T), it is observed that the magnetic behavior of the hexagonal HoMnO₃ film is different from that of the orthorhombic HoMnO₃ film. We expect that this systematic study will serve as a guidance to make high quality HoMnO₃ films with different structures. And, these films can be eventually utilized for the applications of multiferroic devices.