HIGH-FREQUENCY EXCITATIONS OF STRIPE-DOMAIN LATTICES IN MAGNETIC GARNET-FILMS

Magnetic garnet films of composition (Y,Bi)3(Fe, Al)5O12 have been grown by liquid phase epitaxy on [111] and [110] oriented substrates of gadolinium gallium garnet. The domain wall resonance and the two branches of the domain resonance of periodic stripe domains are measured as function of the bias induction applied in the film plane parallel to the stripes. Resonance frequencies up to 7.5 GHz are observed. An improved version of the hybridization model is developed to describe these resonances. It turns out that hybridization of the domain resonance branches is determined by the cubic anisotropy for [111] oriented films, while for [1101 oriented films coupling of the domain resonances is mainly, caused by the orthorhombic anisotropy. The theoretical model is in excellent agreement with experiments, no fitting parameters are used. It is also used to derive the phase relation between the precessing magnetizations of neighbouring domains.