EFFECT OF SURFACE SPIN PINNING ON THE SPIN-WAVE PROPAGATION IN YTTRIUM-IRON-GARNET FILMS

The effect of the surface spin pinning on the spin-wave dispersion and propagation characteristics of yttrium iron garnet (YIG) film was stu died both experimentally and theoretically. Modification of the spin-w ave amplitude frequency response due to the variations of the pinning conditions on the film surfaces and the bias magnetization direction w as studied. Ion bombardment with low-energy H+ ions was used to contro l the surface spins pinning, Strong attenuation notches in the spin-wa ve amplitude-frequency response of ion processed YIG film was treated in terms of dipole hybridization of dispersion branches and appearance of the dipole ''gaps'' in spin-wave spectrum, The hybridization of sp in-wave spectrum was studied for the case of arbitrary magnetization d irection and arbitrary surface spin pinning, It has been found that fo r noninfinite pinning of surface spins, there are magnetization direct ions for which the gaps in the spectrum are smaller than relaxation fr equency, and spin-wave response is smooth.