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The main object of investigation in magnonics, spin waves (SWs) are promisinginformation carriers. Presently the most commonly studied are plane wave-likeSWs and SWs propagating in confined structures, such as waveguides. Here weconsider a Gaussian SW beam obliquely incident on an ultra-narrow interfacebetween two identical ferromagnetic materials. We use an analytical model andmicromagnetic simulations for an in-depth analysis of the influence of theinterface properties, in particular the magnetic anisotropy, on thetransmission of the SW beam. We derive analytical formulas for the reflectance,transmittance, phase shift and Goos-Hanchen (GH) shift for beams reflected andrefracted by an interface between two semi-infinite ferromagnetic media; theresults for the refracted beam are the first to be reported to date. The GHshifts in SW beam reflection and transmission are confirmed by micromagneticsimulations in the thin-film geometry. We demonstrate the dependence of thecharacteristic properties on the magnetic anisotropy at the interface, theangle of incidence and the frequency of the SWs. We also propose a method forthe excitation of high-quality SW beams in micromagnetic simulations.

Goos-Hanchen shift of a spin-wave beam transmitted through anisotropic interface between two ferromagnets