Berlin 2012 – scientific programme
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MA: Fachverband Magnetismus
MA 4: Spin-dependent Transport Phenomena
MA 4.6: Talk
Monday, March 26, 2012, 10:45–11:00, H 1012
Spin polarized tunneling in MgO-based tunnel junctions with superconducting electrodes — •Oliver Schebaum1, Günter Reiss1, Jagadeesh S. Moodera2, and Andy Thomas1 — 1Thin Films and Physics of Nanostructures, Physics Department, Bielefeld University, Germany — 2Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
We prepared magnetic tunnel junctions with one ferromagnetic and one superconducting Al-Si electrode. Pure cobalt electrodes were compared with a Co-Fe-B alloy and the Heusler compound Co2FeAl. The polarization of the tunneling electrons was determined using the Maki-Fulde-model and is discussed along with the spin-orbit scattering and the total pair-breaking parameters. The junctions were post-annealed at different temperatures to investigate the symmetry filtering mechanism responsible for the giant tunneling magnetoresistance ratios in Co-Fe-B/MgO/Co-Fe-B junctions.