Abstract
Magnetoelastic excitations with a fine structure in the 50kHz range have been observed in the study of the domain wall resonance (DWR) in magnetic garnet thin films. DWR excites standing transverse elastic waves which have a resonance frequency given by f= nv 2d , where f is the frequency, n is an integer, v=3.5×10 5 cm/sec is the transversal velocity of the elastic wave, and d=0.05 cm is thickness of the film/substrate system. A fine structure associated with each of these modes has been identified as due to two dimensional bulk elastic waves by using a set of parallel microstrip lines. The dispersion relation of these elastic waves is ω 2= v 2( k 2 1+ k 2 2), where ω is the radial frequency, k 1 and k 2 are the wave vectors in the orientation perpendicular and parallel to the sample surface respectively. In the case of k 1⪢k 2, f= f 0+v 2k 2 2 f 0 , where f 0 is the resonance when k 2=0. The experimental results are in excellent agreement with this model. A linear dispersion, observed when using a shorted slot-line structure, is understood as the excitation of three dimensional modes due to the complex structure of the slot-line and the sample geometry.
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