THz Absorption Spectroscopy Study of Spin Waves in Orthoferrite YFeO<sub>3</sub>

ORAL

Abstract

YFeO3 has an orthorhombic distorted perovskite structure of Pnma symmetry group. Below Néel temperature of about 655 K, the Fe spins S=5/2 arrange in an antiferromagnetic (AFM) state Γ4(Ga,Fc,Ab) with canted spins and a weak ferromagnetic component along the c axis. This complex spin structure is described by a combination of AFM nearest-neighbor couplings, Dzyaloshinsky-Moriya (DM) interactions and single-ion anisotropies.
Earlier studies show coexistence of magnetic and ferroelectric orderings in YFeO3. Therefore, detailed description of magnetic interactions in this material is a step towards understanding the mechanisms in multiferroics, in which magnetic properties can be tuned with electric field.
We have measured absorption of THz radiation in YFeO3 single crystals at the temperature below 4 K in magnetic fields up to B = 15 T. Two spin wave modes were observed at the Γ-point with zero-field energies 1.2 and 2.4 meV. From the B dependence of mode energies we have quantified the parameters of DM interactions and single-ion anisotropies. The obtained values of the AFM interactions are consistent with neutron scattering results.

*The Estonian Ministry of Education and Research under Grant No. IUT23-03, and the European Regional Development Fund project TK134 is acknowledged.

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Presenters

  • Kirill Amelin

    • National Institute of Chemical Physics and Biophysics

Authors

  • Kirill Amelin

    • National Institute of Chemical Physics and Biophysics

  • Toomas Room

    • National Institute of Chemical Physics & Biophysics
    • National Institute of Chemical Physics and Biophysics

  • Urmas Nagel

    • National Institute of Chemical Physics & Biophysics
    • National Institute of Chemical Physics and Biophysics

  • Randy Fishman

    • Oak Ridge National Lab
    • Oak Ridge National Laboratory

  • Je-Guen Park

    • Center for Correlated Electron Systems, Institute for Basic Science , Department of Physics and Astronomy, Seoul National University
    • Seoul Natl Univ
    • Department of Physics & Astronomy, Seoul National University
    • Physics, Seoul Natl Univ
    • Department of Physics and Astronomy, Seoul Natl Univ
    • Seoul National University

  • Hasung Sim

    • Department of Physics & Astronomy, Seoul National University

  • Kisoo Park

    • Seoul Natl Univ
    • Department of Physics & Astronomy, Seoul National University
    • Physics, Seoul Natl Univ

  • Yoshiyuki Yoshida

    • National Institute of Advanced Industrial Science and Technology
    • AIST