Epitaxially stabilized hexagonal TbMnO$_{3}$ thin films

ORAL

Abstract

We observed that hexagonal TbMnO$_{3}$ thin films showed multiferroic properties with enhanced ferroelectricity. The hexagonal TbMnO$_{3}$ thin film shows 1.6 \textit{$\mu $}C/cm$^{2}$ as the remnant polarization value, which is 20 times larger than that of its orthorhombic bulk phase. In addition, the ferroelectric Curie temperature is shifted to 60 K compared to the low temperature value (27 K) of its bulk orthorhombic phase. Interestingly, the hexagonal TbMnO$_{3}$ film displayed the emergence of a new antiferroelectric-like phase just above 65 K, which is the first of its kind in the family of multiferroic hexagonal manganites. A clear anomaly in dielectric constant near the antiferromagnetic Neel temperature ($T_{N}\sim $70 K) shows the possible coupling between the spin and charge degrees of freedom. This is indeed confirmed by the observed second-order magnetoelectric effect below $T_{N}$.

–

Authors

  • Daesu Lee

    • ReCOE \& FPRD, Department of Physics and Astronomy, Seoul National University
    • ReCOE \& FPRD, Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea

  • Jung-Hyuk Lee

    • ReCOE \& FPRD, Department of Physics and Astronomy, Seoul National University

  • Pattukkannu Murugavel

    • ReCOE \& FPRD, Department of Physics and Astronomy, Seoul National University

  • Hyejin Ryu

    • ReCOE \& FPRD, Department of Physics and Astronomy, Seoul National University

  • Tae Won Noh

    • ReCOE \& FPRD, Department of Physics and Astronomy, Seoul National University

  • Jae Wook Kim

    • CSCMR, Department of Physics and Astronomy, Seoul National University

  • Hyung Jin Kim

    • CSCMR, Department of Physics and Astronomy, Seoul National University

  • Kee Hoon Kim

    • CSCMR, Department of Physics and Astronomy, Seoul National University

  • Younghun Jo

    • Quantum Material Research Team, Korea Basic Science Institute

  • Myung-Hwa Jung

    • Quantum Material Research Team, Korea Basic Science Institute

  • Jong-Gul Yoon

    • Department of Physics, University of Suwon

  • Jin-Seok Chung

    • Department of Physics and CAMDRC, Soongsil University