Regensburg 2010 – scientific programme

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MA: Fachverband Magnetismus

MA 33: Poster II

MA 33.86: Poster

Friday, March 26, 2010, 11:00–14:00, Poster B1

On the spin polarization of Co-Mn-Sb thin films — •Jan Schmalhorst, Markus Meinert, and Günter Reiss — Universität Bielefeld, Fakultät für Physik, Dünne Schichten und Physik der Nanostrukturen, 33615 Bielefeld

Thin Co-Mn-Sb films of different compositions were investigated and utilized as electrodes in alumina based magnetic tunnel junctions with CoFe counter electrode. The preparation conditions were optimized with respect to magnetic and structural properties. The Co-Mn-Sb / Al-O interface was analyzed by X-ray absorption spectroscopy and magnetic circular dichroism with particular focus on the elementspecific magnetic moments. Co-Mn-Sb crystallizes in different complex cubic structures depending on its composition. The magnetic moments of Co and Mn are ferromagnetically coupled in all cases. A tunnel magneto resistance ratio of up to 24% at 13K was found and indicates that Co-Mn-Sb is not a ferromagnetic half-metal. These results are compared to recent works on the structure and predictions of the electronic properties.