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

Document Type

Article

Publication Date

10-19-2012

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. © 2012 American Physical Society.

Identifier

84867812808 (Scopus)

Publication Title

Physical Review B Condensed Matter and Materials Physics

External Full Text Location

https://doi.org/10.1103/PhysRevB.86.144112

e-ISSN

1550235X

ISSN

10980121

Issue

14

Volume

86

Fund Ref

National Science Foundation

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