We present theoretical and experimental results on the losses and confinement of spin waves (SW) in a Ferromagnetic/Normal Metal/Air/Ferrite multilayer structure. The above structure can be used for the creation of a desired topology of static magnetic field in a thin ferrite film, used as SW waveguide. It is shown that a screening Normal Metal (NMe) layer, inserted between SW waveguide and ferromagnetic (FM) layer, significantly decreases the SW losses caused by a lossy FM. It is also shown that the SW amplitude increases within the air gap (d) between a Ferrite film and NMe layer, when the gap satisfies the relation kd = 1, where k is SW wavenumber. The power flow density at Ferrite/Air interface is maximal when d is equal to a quarter wavelength of SW.
This research was funded by the Ministry of Science and Innovation (Spain) through project number RTI2018-095856-B-C22, Universidad Nacional Autónoma de México through the projects PAPIIT grant number AG100521 and IG100521, and CONACyT grant number A1-S-22695. D.M. acknowledges the financial support from the Fundación General CSIC via Programa ComFuturo. J.F. acknowledges the scholarship from CONACyT.