Study of the excitation of magnetostatic modes in yttrium-iron-garnet films by a microstrip line

Abstract

Magnetostatic modes in a rectangular yttrium-iron-garnet film, magnetized by a normal or parallel magnetic field, were excited using a microstrip line. The modes spectra are used to investigate the coupling between the microstrip and the magnetostatic waves in the film and to examine the theory of the dispersion of these waves. It is shown that when the microstrip is lifted off the film it excites magnetostatic waves in all directions whereas when it is close to the film waves are emitted only in the directions close to the normal to the microstrip line. These results are discussed in view of their implications to magnetostatic wave devices.