Berlin 2012 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 52: Poster II - Magnetic Heusler compounds, Magnetic shape memory alloys, Thin Films, Micro-/Nano-structured magnetic materials, Graphene, Spins in organics, Magnetic imaging, Surface Magnetism, Spin excitations/Torque, Spincaloric transport
MA 52.6: Poster
Freitag, 30. März 2012, 11:00–14:00, Poster A
Spin-wave propagation in a Co2Mn0.6Fe0.4Si Heusler waveguide — Thomas Sebastian1,2, •Philipp Pirro1, Thomas Brächer1,2, Alexander A. Serga1, Burkard Hillebrands1, Yusuke Ohdaira3, Hiroshi Naganuma3, Mikihiko Oogane3, and Yasuo Ando3 — 1FB Physik und Landesforschungszentrum OPTIMAS, TU Kaiserslautern, 67663 Kaiserslautern, Germany — 2Graduate School Material Science in Mainz, Staudinger Weg 9, 55128 Mainz, Germany — 3Departement of Applied Physics, Tohoku University, Sendai, Japan
The class of Cobalt-based full Heusler compounds combines high Curie temperatures and spin polarizations with a lower Gilbert damping than most conventional 3d-ferromagnets [1]. These material parameters make them promising candidates in the emerging field of magnon spintronics. In this concept, information is transferred and processed via magnons - the excitations of the magnetic system - without flow of electronic currents. Here we present the first observation of spin dynamics in a microstructured Heusler waveguide using Brillouin light scattering microscopy. The low magnetic losses estimated by FMR measurements [2] have been confirmed by the increase of the observed propagation distances (up to 80 µ m, with an exponential decay length of at least 10 µ m) compared to the commonly used Ni81Fe19.
We acknowledge financial support by the DFG Research Unit 1464: ASPIMATT.
[1] S. Trudel, J. Phys. D: Appl. Phys. 43, 1930001 (2010).
[2] T. Kubota, Appl. Phys. Lett. 94, 122504 (2009).