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Regensburg 2013 – scientific programme

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MA: Fachverband Magnetismus

MA 25: Magnetic Heusler Compounds

MA 25.7: Talk

Wednesday, March 13, 2013, 11:00–11:15, H10

Spin-wave instabilities in a micro-structured Co2Mn0.6Fe0.4Si Heusler waveguide — •Philipp Pirro1, Thomas Sebastian1,2, Thomas Brächer1,2, Alexander A. Serga1, Takahide Kubota3, Hiroshi Naganuma4, Mikihiko Oogane4, Yasuo Ando4, and Burkard Hillebrands11Fachbereich Physik and Landesforschungszentrum OPTIMAS, TU Kaiserslautern, 67663 Kaiserslautern, Germany — 2Graduate School Materials Science in Mainz, Gottlieb-Daimler-Straße 47, 67663 Kaiserslautern, Germany — 3WPI Advanced Institute for Materials Research, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan — 4Department of Applied Physics, Graduate School of Engineering, Tohoku University, Aoba-yama 6-6-05, Sendai 980-8579, Japan

Magnetic Heusler compounds are expected to show novel nonlinear magnonic transport phenomena due to very low Gilbert damping and high decay length for spin-waves [1] for some of these materials.

We present a nonlinear instability of propagating spin waves in the Heusler compound Co2Mn0.6Fe0.4Si which couples the initial spin wave (frequency fMW) with two modes of different frequencies f1 and f2. As the separation Δ f=fMWf1 can reach more than 4 GHz, automodulation effects can be excluded and we interpret our observations as a kinetic instability.

We acknowledge support by the OPTIMAS Carl-Zeiss doctoral program, the DFG Research Unit 1464 and the Strategic Japanese-German Joint Research from JST: ASPIMATT.

[1] T. Sebastian, et al., Appl. Phys. Lett. 100, 112402 (2012).

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