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We report the experimental observation of Snell's law for magneto-static spinwaves in thin ferromagnetic Permalloy films by imaging incident, refracted andreflected waves. We use a thickness step as the interface between two mediawith different dispersion relation. Since the dispersion relation formagneto-static waves in thin ferromagnetic films is anisotropic, deviationsfrom the isotropic Snell's law known in optics are observed for incidenceangles larger than 25\textdegree{} with respect to the interface normal betweenthe two magnetic media. Furthermore, we can show that the thickness stepmodifies the wavelength and the amplitude of the incident waves. Our findingsopen up a new way of spin wave steering for magnonic applications.

Snell's Law for Spin Waves