Abstract
We show both theoretically and experimentally that a collapsing ()-dimensional wave packet in a medium with cubic nonlinearity and a two-dimensional dispersion of an order higher than parabolic irradiates untrapped dispersive waves. The studies are performed for a spin-wave bullet propagating in an in-plane magnetized ferrimagnetic film. An induced uniaxial anisotropy in such a medium leads to the formation of narrow spin-wave caustic beams whose angles to the bullet’s propagation direction are modified by the motion of the source.
- Received 20 September 2010
DOI:https://doi.org/10.1103/PhysRevLett.106.134101
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