Far-infrared spectra of the magnetic exchange resonances and optical phonons and their connection to magnetic and dielectric properties of Dy3Fe5O12 garnet
- Authors
- Kang, T. D.; Standard, E. C.; Rogers, P. D.; Ahn, K. H.; Sirenko, A. A.; Dubroka, A.; Bernhard, C.; Park, S.; Choi, Y. J.; Cheong, S. -W.
- Issue Date
- Oct-2012
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW B, v.86, no.14
- Journal Title
- PHYSICAL REVIEW B
- Volume
- 86
- Number
- 14
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/20095
- DOI
- 10.1103/PhysRevB.86.144112
- ISSN
- 1098-0121
- Abstract
- 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 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.
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Collections - College of Natural Sciences > Department of Physics > 1. Journal Articles
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