Magnetoelectric coupling at the EuO/BaTiO$_{3}$ interface

ORAL

Abstract

Magnetization modulation by ferroelectric polarization pinning is reported for the ferromagnetic-ferroelectric EuO/BaTiO$_{3}$ (EuO/BTO) heterostructures. Away from T$_{c}$, the critical exponent $\beta $ indicates that the magnetization of EuO is consistent with mean field theory despite suggestions that EuO is a typical Heisenberg ferromagnetic semiconductor. The Heisenberg model is also inconsistent with the significant band dispersion seen in EuO thin films. The possible mechanisms include extrinsic doping and/or pinning of interface states at the EuO/BTO interface. The results are discussed in the context of data also obtained for La$_{0.67}$Sr$_{0.33}$MnO$_{3}$/BaTiO$_{3}$ heterostructures, where the critical exponent $\beta $ is also close to the predictions of mean field theory, suggesting a similarity in the importance of the magnetic interface with a ferroelectric and the possible importance of ferroelectric polarization reversal.

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Authors

  • Shi Cao

    Dept. of Physics and Astronomy, Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588, USA

  • Pan Liu

    Dept. of Physics \& Astronomy, University of Wyoming, Laramie, Wyoming 82071 USA

  • Jinke Tang

    Dept. of Physics \& Astronomy, University of Wyoming, Laramie, Wyoming 82071 USA

  • Chung Wung Bark

    Dept. of Materials Science and Engineering, University of Wisconsin-Madison, Wisconsin 53706, USA

  • Sangwoo Ryu

    Dept. of Materials Science and Engineering, University of Wisconsin-Madison, Wisconsin 53706, USA, University of Wisconsin-Madison

  • Chang-Beom Eom

    Dept. of Materials Science and Engineering, University of Wisconsin-Madison, Wisconsin 53706, USA, University of Wisconsin-Madison, Department of Materials Sciences and Engineering, University of Wisconsin-Madison

  • Peter Dowben

    Department of Physics, University of Nebraska, Lincoln, 68588, USA, Dept. of Physics and Astronomy, Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588, USA

  • Alexei Gruverman

    Dept. of Physics and Astronomy, Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588, USA