Experimental observation of nonreciprocal attenuation of surface waves in yttrium iron garnet

摘要

Measurements are presented of the nonreciprocal attenuation of Rayleigh surface waves propagating parallel with the magnetic field along the 〈111〉 direction in yttrium iron garnet. These measurements are compared with the calculation and confirm that the surface wave attenuation in this material results primarily from the radiation of spin waves into the bulk. The discrepancies which exist in comparing the observed and calculated attenuation levels are thought to arise in Emtage’s calculations when taken only to the first order in the elastic anisotropy.