## Direct observation of two-dimensional self-focusing of spin waves in magnetic films

• The first observation of self-focusing of dipolar spin waves in garnet film media is reported. In particular, we show that the quasi-stationary diraction of a nite-aperture spin wave beam in a focusing medium leads to the concentration of the wave power in one focal point rather than along a certain line(channel). The obtained results demonstrate the wide applicability of nonlinear spin wave media to study nonlinear wave phenomena using an advanced combined microwave-Brillouin light scattering technique for a two-dimensional mapping ofthe spin wave amplitudes.

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