Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 13: Poster Ia: Electron Theory (1); Magnetic Imaging (2,3); Thin Films (4-25); MSMA (26-33); Magn. Semiconductors (34-42); Magn. Half Metals and Oxides (43-60)

MA 13.13: Poster

Dienstag, 24. März 2009, 10:15–13:00, P1A

Sputtering deposition of epitaxial Co₂Mn_1−xFe_xSi and Co₂MnAl films — •Enrique Vilanova Vidal, Horst Schneider, and Gerhard Jakob — Institut für Physik, Johannes Gutenberg-Universität Mainz

Recently it has been discussed whether the Heusler compounds Co₂Mn_0.5Fe_0.5Si and Co₂MnAl are halfmetallic systems. The comparison of band structure calculations with experimental results indicate that electron correlations play an important role in this question. In order to gain further insight into the electronic structure of these materials, we have prepared thin films of Co₂Mn_0.5Fe_0.5Si and Co₂MnAl. These films were grown by cathode sputtering on MgO (100) with and without MgO buffer layer using an UHV deposition system. The investigated films grow epitaxially and possess the fully ordered L2₁ Heusler structure. We discuss the deposition procedure and measurements of composition, crystal structure and magnetic properties of the films with respect to the electronic structure of the alloys.