Unlike light, caustic spin-wave beams (red), emitted from the left in a medium with externally controlled anisotropy, do not diffract while propagating through a solid or bounce off boundaries with the reflection angle equal to the angle of incidence.
From the article:
Nondiffractive Subwavelength Wave Beams in a Medium with Externally Controlled AnisotropyT. Schneider, A. A. Serga, A. V. Chumak, C. W. Sandweg, S. Trudel, S. Wolff, M. P. Kostylev, V. S. Tiberkevich, A. N. Slavin, and B. Hillebrands
Phys. Rev. Lett. 104, 197203 (2010)
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