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 Co₂Mn_0.6Fe_0.4Si Heusler waveguide — •Philipp Pirro¹, Thomas Sebastian^1,2, Thomas Brächer^1,2, 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 Co₂Mn_0.6Fe_0.4Si which couples the initial spin wave (frequency f_MW) with two modes of different frequencies f₁ and f₂. As the separation Δ f=f_MW−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).