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
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- English
- Classification
- Physics
- License
- License undefined
- Identifiers
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- RERO DOC 31082
- DOI 10.1103/PhysRevB.86.144112
- Persistent URL
- https://folia.unifr.ch/unifr/documents/302704
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