Adjusted oscillator strength matching for hybrid magnetic and electric excitations in Dy(3)Fe(5)O(12) garnet

• Authors: ROGERS P D; CHOI Y J; STANDARD E C; KANG T D; AHN K H; DUBROKA Adam; MARŠÍK Přemysl; WANG Ch; BERNHARD Christian; PARK S.; CHEONG S W; KOTELYANSKII M.; SIRENKO A A
• Year of publication: 2011
• Type: Article in Periodical
• Magazine / Source: Physical Review B
• MU Faculty or unit: Faculty of Science
• Field: Solid matter physics and magnetism
• Keywords: far-infrared ellipsometry; multiferroics
• Description: Far-infrared spectra of magnetodielectric Dy3Fe5O12 garnet were studied using a combination of transmittance, reflectivity, and rotating analyzer ellipsometry. In addition to purely dielectric and magnetic modes, we observed several hybrid modes with a mixed magnetic and electric dipole activity. Using 4 x 4 matrix formalism for materials with mu(omega) <> 1, we modeled the experimental optical spectra and determined the far-infrared dielectric and magnetic permeability functions. The matching condition mu(omega_h)Se = epsilon(omega_h)Sm for the oscillator strengths Se/m explains the observed vanishing of certain hybrid modes at omega_h in reflectivity.