Journal article

Far-infrared spectra of the magnetic exchange resonances and optical phonons and their connection to magnetic and dielectric properties of Dy₃Fe₅O₁₂ garnet

  • Kang, T. D. Department of Physics, New Jersey Institute of Technology, Newark, USA
  • Standard, E. C. Department of Physics, New Jersey Institute of Technology, Newark, USA
  • Rogers, P. D. Department of Physics, New Jersey Institute of Technology, Newark, USA
  • Ahn, K. H. Department of Physics, New Jersey Institute of Technology, Newark, USA
  • Sirenko, Andrei A. Department of Physics, New Jersey Institute of Technology, Newark, USA
  • Dubroka, Adam Department of Physics, University of Fribourg, Switzerland
  • Bernhard, Christian Department of Physics, University of Fribourg, Switzerland
  • Park, S. Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey USA - Department of Physics, Chung-Ang University, Seoul, Korea
  • Choi, Y. J. Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey USA - Department of Physics and IPAP, Yonsei University, Seoul, Korea
  • Cheong, S.-W. Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey USA
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    19.10.2012
Published in:
  • Physical Review B - Condensed Matter and Materials Physics. - 2012, vol. 86, no. 14, p. 144112
English Far-infrared spectra of ferrimagnetic Dy₃Fe₅O₁₂ single crystals have been studied in the spectral range between 12 and 700 cm⁻¹ and in a wide temperature range between 5 K and 300 K using transmission spectroscopy and rotating analyzer ellipsometry. In the temperature range below TC = 16 K for the magnetic ordering of Dy³⁺ spins, a number of ligand field and Kaplan-Kittel (KK) exchange resonance modes have been found. Temperature dependencies of their frequencies allowed us to estimate the ratio between the Fe-Dy and Dy-Dy exchange constants. We found that variation of the oscillator strength of the KK modes correlates with the magnetic-field-induced changes of magnetic permeability. The low-temperature peak in the static value of the dielectric function at TC = 16 K may be related to the observed temperature-induced variation of the oscillator strength of the optical phonons.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Physics
License
License undefined
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Persistent URL
https://folia.unifr.ch/unifr/documents/302704
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