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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 52.4: Poster
Friday, March 30, 2012, 11:00–14:00, Poster A
Evolution of atomic order upon annealing in Co2MnSi thin films probed by 59Co and 55Mn NMR — •Steven Rodan1, Alexey Alfonsov1, Sabine Wurmehl1, Filippo Ferraro2, Jürgen Kohlhepp2, Bert Koopmans2, Yuya Sakuraba3, Bosu Subrojati3, Koki Takanashi3, and Bernd Büchner1 — 1Leibniz Institute for Solid State and Materials Research (IFW), 01171 Dresden, Germany — 2Eindhoven University of Technology, 5600 MB Eindhoven, Netherlands — 3Institute for Materials Research, Tohoku University, 980-8577 Sendai, Japan
Materials with high spin polarization at the Fermi level are highly desirable for spintronics applications. Many intermetallic Heusler compounds, such as Co2MnSi, exhibit half-metallic ferromagnetism with such large spin polarization, but this tends to depend strongly on the ordering of the atoms in the crystal lattice. Pulsed nuclear magnetic resonance (NMR) proves to be essential for identifying the type(s) of disorder present by investigating the structure locally. We performed 59Co and 55Mn NMR experiments on several annealed and as-cast Co2MnSi thin films, the results of which together reveal that the atomic ordering evolves with different annealing temperatures. We compare our results with previous structural analysis which used x-ray diffraction.