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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 Hillebrands1 — 1Fachbereich 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=fMW−f1 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).