Optical investigation of domain resonances in magnetic garnet films

Autor(en): Bahlmann, N
Gerhardt, R
Dotsch, H
Stichwörter: CONVERSION; EXCITATIONS; GUIDED-LIGHT; LATTICES; light modulation; magnetic domains; magnetic films; magnetic resources; MAGNETOSTATIC WAVES; Materials Science; Materials Science, Multidisciplinary; MODES; MODULATION; Physics; Physics, Condensed Matter
Erscheinungsdatum: 1996
Herausgeber: ELSEVIER SCIENCE BV
Journal: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volumen: 161
Startseite: 22
Seitenende: 30
Zusammenfassung: 
Magnetic garnet films of composition (Y,Ri)(3)(Fe,Al)(5)O-12 are grown by liquid phase epitaxy on [111] oriented substrates of Cd3Ga5O12. Lattices of parallel stripe domains are stabilized by astatic induction applied in the Film plane. The two branches DR of the domain resonance and the domain wall resonance DWR are excited by microwave magnetic fields in the frequency range up to 6 GHz. Light passing thr stripe domain lattice parallel to the film normal is modulated at the excitation frequency. A modulation bandwidth of more than 2 GHz is observed. The resonances can be calculated with high accuracy by a hybridization model, if the quality factor Q of the film exceeds 0.5. For Q < 0.5 a simple approximation is used to describe the superposition of the DR(+) and DR(-) resonances. The superposition model predicts two stability states of the resonance DR(+) which are observed experimentally. From the optical measurements precession angles of the resonance DR(-) of nearly 6 degrees and wall oscillation amplitudes up to 25 nm are derived.
ISSN: 03048853
DOI: 10.1016/S0304-8853(96)00064-9

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