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MA: Fachverband Magnetismus
MA 4: Magnetic Heuslers, Half-metals and Oxides I (with TT)
MA 4.1: Vortrag
Montag, 31. März 2014, 09:30–09:45, BEY 118
Explaining magnetism in Manganese-based Heusler compounds — •Lukas Wollmann, Gerhard H. Fecher, and Claudia Felser — Max Planck Insitute for Chemical Physics of Solids, Dresden, Germany
From the onset of research in the field of half-metallic ferromagnets, Manganese containing Heusler compounds were the most promising, and most intensely studied trailblazing materials. Accompanying the field of half-metallicity, spintronics emerges as a natural consequence. Focusing on the measurable quantities as Curie temperatures, spin-polarized currents and Hall conductance the field has been, from the beginning on, supported by theoretical methods.
In contrast to purely ferromagnetic Co2-based Heusler compounds, Manganese containing Heusler alloys (Mn2YZ and X2MnZ) exhibit different types of magnetic ordering. The peculiar role of the Manganese atoms and their related magnetic contribution to the quantities of interest shall be elucidated. The main focus lies on the local magnetic structures of the aforementioned material. Following this local perspective, the influence of the magnetic moments on the atomic interplay in form of the Heisenberg exchange interactions is monitored. The computations have been carried out employing the FLAPW DFT code Wien2k and the relativistic Munich SPR-KKR package for the calculation of the exchange constants.