Far-infrared spectra of the magnetic exchange resonances and optical phonons and their connection to magnetic and dielectric properties of Dy 3Fe 5O 12 garnet

T. D. Kang, E. C. Standard, P. D. Rogers, K. H. Ahn, A. A. Sirenko, A. Dubroka, C. Bernhard, S. Park, Y. J. Choi, S. W. Cheong

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Abstract

Far-infrared spectra of ferrimagnetic Dy 3Fe 5O 12 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 T C = 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 T C = 16 K may be related to the observed temperature-induced variation of the oscillator strength of the optical phonons.

Original languageEnglish
Article number144112
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume86
Issue number14
DOIs
Publication statusPublished - 2012 Oct 19

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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