%0 Conference Article %T ON THE APPLICABILITY OF THE CONCEPT OF "GROUP VELOCITY" IN THE DESCRIPTION OF THE SURFACE SPIN WAVES %A Lokk, E.. %K the ferrite film surface of the spin wave group velocity, the ratio of derivatives of the dispersion dependence %J XXIV international conference "Electromagnetic field and materials (fundamental physical research)" %D 2024 %P 14 %I INFRA-M Academic Publishing LLC.