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Dresden 2011 – scientific programme

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MA: Fachverband Magnetismus

MA 52: Magnetic Thin Films III

MA 52.1: Talk

Thursday, March 17, 2011, 11:00–11:15, HSZ 403

Electronic structure of fully epitaxial Co2TiSn thin films — •Markus Meinert1, Jan-Michael Schmalhorst1, Hendrik Wulfmeier1, Günter Reiss1, Elke Arenholz2, Tanja Graf3, and Claudia Felser31Dünne Schichten und Physik der Nanostrukturen, Fakultät für Physik, Universität Bielefeld, 33501 Bielefeld, Deutschland — 2Advanced Light Source, Lawrence Berkeley National Laboratory, CA 94720, USA — 3Institut für Anorganische Chemie und Analytische Chemie, Johannes-Gutenberg-Universität, 55128 Mainz, Deutschland

We report on the properties of thin films of the full Heusler compound Co2TiSn prepared by DC magnetron co-sputtering. Fully epitaxial, stoichiometric films were obtained by deposition on MgO (001) substrates at substrate temperatures above 600C. The films are well ordered in the L21 structure, and the Curie temperature exceeds slightly the bulk value. They show a significant, isotropic magnetoresistance and the resistivity becomes strongly anomalous in the paramagnetic state. The films are weakly ferrimagnetic, with nearly 1 µB on the Co atoms, and a small antiparallel Ti moment, in agreement with theoretical expectations. X-ray absorption spectra on the Co L3,2 edges, including circular and linear magnetic dichroism are compared with ab initio calculations of the x-ray absorption and circular dichroism spectra. We infer that the electronic structure of Co2TiSn has essentially non-localized character. Spectral features that have not been explained in detail before, are explained here in terms of the final state band structure.

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