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Phys Rev Lett. 2013 Feb 8;110(6):067201. Epub 2013 Feb 4.

Nonlinear emission of spin-wave caustics from an edge mode of a microstructured Co2Mn(0:6)Fe(0:4)Si waveguide.

Author information

1
Fachbereich Physik and Forschungszentrum OPTIMAS, Technische Universit├Ąt Kaiserslautern, 67663 Kaiserslautern, Germany. tomseb@physik.uni-kl.de

Abstract

Magnetic Heusler materials with very low Gilbert damping are expected to show novel magnonic transport phenomena. We report nonlinear generation of higher harmonics leading to the emission of caustic spin-wave beams in a low-damping microstructured Co(2)Mn(0.6)Fe(0.4)Si Heusler waveguide. The source for the higher harmonic generation is a localized edge mode formed by the strongly inhomogeneous field distribution at the edges of the spin-wave waveguide. The radiation characteristics of the propagating caustic waves observed at twice and three times the excitation frequency are described by an analytical calculation based on the anisotropic dispersion of spin waves in a magnetic thin film.

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