Faculté des sciences

Adjusted oscillator strength matching for hybrid magnetic and electric excitations in Dy₃Fe₅O₁₂ garnet

Rogers, P. D. ; Choi, Y. J. ; Standard, E. C. ; Kang, T. D. ; Ahn, K. H. ; Dubroka, A. ; Marsik, P. ; Wang, Ch. ; Bernhard, Christian ; Park, S. ; Cheong, S.-W. ; Kotelyanskii, M. ; Sirenko, A. A.

In: Physical Review B - Condensed Matter and Materials Physics, 2011, vol. 83, no. 17, p. 174407

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 4×4 matrix formalism for materials with μ(ω)≠1, we modeled the experimental... Plus

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    Summary
    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 4×4 matrix formalism for materials with μ(ω)≠1, we modeled the experimental optical spectra and determined the far-infrared dielectric and magnetic permeability functions. The matching condition μ(ωh)Se=ɛ(ωh)Sm for the oscillator strengths S₍₎ explains the observed vanishing of certain hybrid modes at ωh in reflectivity.