Nonlinear emission of spin-wave caustics from an edge mode of a micro-structured Co2Mn0.6Fe0.4Si waveguide

T. Sebastian (1 , 2) , P. Pirro (1) , T. Kubota (3) , T. Br\"acher (1 , 3) , A. A. Serga (1) , H. Naganuma (4)

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M. Oogane (4) Y. Ando (4) B. Hillebrands (1) ((1) Fachbereich Physik Forschungszentrum OPTIMAS TU Kaiserslautern Kaiserslautern Germany (2) Graduate School Materials Science in Mainz (3) WPI Advanced Institute for Materials Research Tohoku University Aoba-ku Sendai Japan (4) Department of Applied Physics Graduate School of Engineering Aoba-yama Japan)

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classification ❄️ cond-mat.mes-hall physics.optics

keywords spin-wavewaveguidecausticco2mn0edgeemissiongenerationheusler

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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, micro-structured Co2Mn0.6Fe0.4Si 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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Nonlinear emission of spin-wave caustics from an edge mode of a micro-structured Co2Mn0.6Fe0.4Si waveguide

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