J. Phys. IV France 07 (1997) C1-713-C1-714
Magnetooptical Effects at Submillimetre Wavelengths Near AFMR in YFeO3A.A. Mukhin1, V.D. Travkin1, S.P. Lebedev1, A.S. Prokhorov1, A.M. Balbashov2 and I. Yu. Parsegov2
1 General Physics Institute of the Russian Academy of Sciences, 38 Vavilov St., 117942 Moscow, Russia
2 Moscow Power Engineering Institute, 14 Krasnokazarmennaya St., 105835 Moscow, Russia
Spectra of the transmission t(v), ellipticity ρ(v) and Faraday rotation angle αF(v) have been measured in YFeO3 single crystals near AFMR mode (v1 ≈ 10 cm-1) using the quasi-optical submillimetre backward-wave-oscillator spectrometer. A resonance behaviour of the T(v), ρ(v) and αF(v) spectra was observed near AFMR. The theoretical calculations and computer simulations made it possible to describe the observed T(v), ρ(v) and αF(v) spectra and to determine both diagonal and non-diagonal components of the permittivity and permeability of the YFeO3. An unusual effect of the weak magnetic field (H≈250 Oe) along magnetic moment (m||c-axis) on the line-shape and intensity of the resonance line was revealed and explained by an interference of two normal modes inside the resonance line.
© EDP Sciences 1997