OBSERVATION OF SPATIOTEMPORAL SELF-FOCUSING OF SPIN-WAVES IN MAGNETIC-FILMS

The first observation of spatiotemporal self-focusing of spin waves is reported. The experimental results are obtained for dipolar spin wave s in yttrium-iron-garnet films by means of a newly developed space- an d time-resolved Brillouin Light scattering technique. They demonstrate self-focusing of a moving wave pulse in two spatial dimensions, and f ormation of localized two-dimensional wave packets, the collapse of wh ich is stopped by dissipation. The experimental results are in good qu alitative agreement with numerical simulations. [S0031-9007(98)07425-0 ].