THz spectroscopy of BiFeO<sub>3</sub> in the magnetic-field-induced canted AFM state.

ORAL

Abstract

BiFeO3 is a well-known room temperature multiferroic material where the cycloidal magnetic order induces electric polarization in addition to existing polarization. The cycloidal order is transformed by strong magnetic fields into a canted antiferromagnetic (AFM) order above B=18T and the cycloidal modes are replaced by excitations of the canted AFM structure [U. Nagel et al., Phys. Rev. Lett., 110:257201, (2013)].
Here we present the THz spectroscopy results for three different magnetic field orientation, parallel to hexagonal c axis, perpendicular and parallel to a axis, measured on the single FE domain crystals grown by the laser-diode heating floating-zone method [T. Ito et al., Cryst. Growth Des. 11 (2011) 5139]. The dependence of mode frequencies as a function of magnetic field were studied up to 35T at liquid He temperatures. In light of these experimental results, a microscopic model is proposed for the canted AF phase.

*Part of the research was supported by the by the Estonian Ministry of Education and Research Grant IUT23-3 and by the European Regional Development Fund project TK134.

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Presenters

  • Johan Viirok

    • National Institute of Chemical Physics and Biophysics
    • National Institute of Chemical Physics and Biophysics, Estonia

Authors

  • Johan Viirok

    • National Institute of Chemical Physics and Biophysics
    • National Institute of Chemical Physics and Biophysics, Estonia

  • Laur Peedu

    • National Institute of Chemical Physics and Biophysics
    • National Institute of Chemical Physics and Biophysics, Estonia

  • Urmas Nagel

    • National Institute of Chemical Physics and Biophysics
    • National Institute of Chemical Physics and Biophysics, Estonia

  • Toomas Room

    • National Institute of Chemical Physics and Biophysics
    • National Institute of Chemical Physics and Biophysics, Estonia

  • Dávid Szaller

    • Institute of Solid State Physics, Vienna University of Technology, Austria

  • Vilmos Kocsis

    • RIKEN
    • Center for Emergent Matter Science (CEMS), RIKEN, Japan
    • Department of Physics, Budapest University of Technology and Economics, Hungary
    • Leibniz Institute for Solid State and Materials Research Dresden
    • RIKEN CEMS

  • Sandor Bordacs

    • Budapest University of Technology and Economics
    • Department of Physics, Budapest University of Technology and Economics and MTA-BME, Hungary
    • Department of Physics, Budapest University of Technology and Economics, Hungary

  • Istvan Kezsmarki

    • University of Augsburg
    • Experimental Physics 5, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, Germany
    • Experimental Physics V, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg

  • Hans Engelkamp

    • High Field Magnet Laboratory, Radboud University
    • High Field Magnet Laboratory, Radboud University, The Netherlands

  • Dima Kamensky

    • High Field Magnet Laboratory, Radboud University, The Netherlands

  • Komalavalli Thirunavukkuarasu

    • National High Magnetic Field Laboratory, Tallahassee, FL
    • Florida A&M University
    • Natl High Magnetic Field Lab

  • Mykhaylo Ozerov

    • National High Magnetic Field Laboratory, Tallahassee, FL
    • National High Magnetic Field Lab
    • National High Magnetic Field Laboratory
    • Natl High Magnetic Field Lab

  • Dmitry Smirnov

    • Natl High Magnetic Field Lab
    • National High Magnetic Field Laboratory, Tallahassee, FL
    • National High Magnetic Field Lab
    • National High Magnetic Field Laboratory
    • national high magnetic field laboratory

  • Jurek Krzystek

    • National High Magnetic Field Laboratory, Tallahassee, FL

  • Yukihiro Ozaki

    • National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan

  • Toshimitsu Ito

    • National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan

  • Yasuhide Tomioka

    • National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan

  • Trinanjan Datta

    • Department of Chemistry and Physics, Augusta University, Augusta, GA
    • Chemistry and Physics, Augusta University

  • Randy Fishman

    • Oak Ridge National Lab
    • Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN
    • Materials Science and Technology Division, OakRidge National Laboratory