Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MA: Fachverband Magnetismus

MA 4: Spin-dependent Transport Phenomena

MA 4.6: Vortrag

Montag, 26. März 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.