Informace o publikaci

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

Název česky	Vzdáleá infračervená spektroskopie magneticky výměnných rezonancí a optických fononů v Dy3Fe5O12 garnetu
Autoři	KANG T D STANDARD E C ROGERS P D AHN K H SIRENKO A A DUBROKA Adam BERNHARD Christian PARK S. CHOI Y J CHEONG S W
Rok publikování	2012
Druh	Článek v odborném periodiku
Časopis / Zdroj	Physical Review B
Fakulta / Pracoviště MU	Středoevropský technologický institut
Citace
www	http://prb.aps.org/abstract/PRB/v86/i14/e144112
Doi	http://dx.doi.org/10.1103/PhysRevB.86.144112
Obor	Fyzika pevných látek a magnetismus
Klíčová slova	TERBIUM IRON-GARNET; POLARIZATION; DYSPROSIUM; FIELD
Popis	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.