P. Gruszecki, Yu. S. Dadoenkova, N. N. Dadoenkova, I. L. Lyubchanskii, J. Romero-Vivas, and M. Krawczyk
Phys. Rev. B 92, 054427 (2015)
Study of propagation of the Gaussian beam of spin waves and its reflection from the edge of thin yttrium-iron-garnet film with in-plane magnetization perpendicular to this edge. The appearance of a negative lateral shift between reflected and incident spin wave beams’ spots is numerically demonstrated. This shift is particularly sensitive to the surface magnetic anisotropy value and is a result of the Goos-Hänchen shift which is sensitive to the magnitude of the anisotropy and of the bending of spin wave beam. The demagnetizing field provide graded increase of the refractive index for spin waves, which is responsible for the bending. These two effects contribute to the total shift of the spin wave beam in the far field.
Fig.1. Schematic plot of the thin YIG film geometry considered in the paper. The film has thickness Lz, which is much smaller than the film's lateral sizes Lx and Ly. ΔX is a total shift of the SW beam reflected at the edge.
