THz and Raman spectroscopy of multiferroic hexagonal ferrites (h-)(Lu,Sc)FeO<sub>3</sub>

ORAL

Abstract

We studied multiferroic hexagonal Lu0.6Sc0.4FeO3 single crystals with non-collinear spins using the THz and Raman scattering spectroscopies. Antiferromagnetic (AFM) resonances, or magnons, were found at about 0.82 THz. The magnon doublet splits in external magnetic fields applied along the c axis with Fe3+ g-factor of 2.5. The magnons harden with the temperature increase and disappear at the temperature above 130 K, which is consistent with the magnetic susceptibility and the AFM transition temperature known for this compound. A strong dichroism at the resonance with the AFM doublet has been observed in magnetic field using both the conventional circular polarization and the THz vector vortex beams.

*This work is supported by DOE grant #DE-FG02-07ER46382

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Presenters

  • Andrei Sirenko

    • New Jersey Inst of Tech
    • Department Of Physics

Authors

  • Andrei Sirenko

    • New Jersey Inst of Tech
    • Department Of Physics

  • F. Lyzwa

    • NJIT and NSLS-II, Brookhaven National Laboratory, Upton NY, USA

  • L. Bugnon

    • Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland

  • P. Marsik

    • Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland

  • Christian Bernhard

    • University of Fribourg
    • Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland

  • Zhenxian Liu

    • Department of Physics, University of Illinois at Chicago
    • Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607-7059, USA

  • Sang-Wook Cheong

    • Rutgers University
    • RCEM and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
    • Rutgers University, New Brunswick