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Coupled Magnetoelastic Resonances in Garnet Crystals Studied by Light Scattering
Author(s) -
Strotmann M.,
Dötsch H.,
Sure S.,
Lührmann B.,
Staas O.
Publication year - 1994
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221820224
Subject(s) - yttrium iron garnet , gadolinium gallium garnet , materials science , ferrimagnetism , resonance (particle physics) , wavelength , excited state , excitation , optics , diffraction , condensed matter physics , epitaxy , magnetization , atomic physics , optoelectronics , physics , magnetic field , layer (electronics) , quantum mechanics , composite material
Films of yttrium iron garnet are grown by liquid phase epitaxy on substrates of gadolinium gallium garnet (GGG) of 5 mm thickness and orientation [111] or [110]. The ferrimagnetic resonance is excited at frequencies up to 2 GHz. Due to the magnetoelastic interaction standing elastic waves across the thickness of the crystal are induced. They have constant frequency separation of 350 kHz. Optical Bragg diffraction by these resonances is studied at a wavelength of 633 nm, yielding a comb structure of stable light oscillators at twice the excitation frequency. From the measurements the ratio P 44 /ΔP for GGG is derived. At high power excitations instability oscillations of the ferrimagnetic resonance occur; the optical measurements demonstrate a strong nonlinear coupling of these instabilities to the elastic resonances.