Dresden 2009 – scientific programme
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MA: Fachverband Magnetismus
MA 40: Poster II: Bio- and Molecular Magnetism (1-9); Magnetic Coupling Phenomena/Exchange Bias (10-15); Magnetic Particlicles and Clusters (16-29); Micro and Nanostructured Magnetic Materials (30-51); Multiferroics (52-64); Spin Injection in Heterostructures (65-67); Spin-Dyn./Spin-Torque (68-93); Spindependent Transport (94-108)
MA 40.97: Poster
Friday, March 27, 2009, 11:00–14:00, P1A
Direct measurement of the spin polarization of Co-Fe and Co-Fe-B — •Savio Fabretti1, Oliver Schebaum1, Andy Thomas1, Günter Reiss1, and Jagadeesh Moodera2 — 1Universität Bielefeld — 2MIT Cambridge
We investigated the spin polarization of Co-Fe and Co-Fe-B thin films with the Meservey-Tedrow method. Superconductor/insulator/ferromagnet (S/I/F) structures were fabricated using shadow masks and DC- and RF-magnetron sputtering in an automatic sputtering system. The samples have been post annealed in a vacuum furnace. The superconducting electrode consists of Al95Si5 while the insulator is MgO. For optimization of the superconducting tunnel junctions the properties of the Al-Si films on MgO buffer layers have been investigated in dependence of the Al-Si thickness and the annealing temperature. The dI/dV measurements were done in a 3He cryostat at a temperature of 0.46K with magnetic fields applied in the range of 2T to 2.8T. Finally, the results were compared with conventional MgO magnetic tunnel junctions with Co-Fe and Co-Fe-B electrodes.