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MA: Fachverband Magnetismus

MA 28: Spin-dependent Transport Phenomena

MA 28.5: Vortrag

Donnerstag, 25. März 2010, 16:15–16:30, H3

Tunneling spectroscopy and magnon excitation in Co₂FeAl/MgO/Co-Fe magnetic tunnel junctions — •Volker Drewello, Daniel Ebke, Markus Schäfers, Günter Reiss, and Andy Thomas — Bielefeld University, 33615 Bielefeld, Germany

Magnetic tunnel junctions with the Heusler compound Co₂FeAl as the soft electrode are prepared. Pinned Co-Fe is used as the hard reference electrode. The electronic transport is investigated by tunneling spectroscopy (dI/dV and d²I/dV²). In the parallel magnetic state the tunneling spectra are asymmetric with respect to the bias voltage, with a pronounced bias-independent region. In the antiparallel state the dependence on bias voltage is much stronger and the curves are symmetric. The findings can be explained with a gap in the minority density of states of Co₂FeAl.