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 52.4: Poster

Freitag, 30. März 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.