Spin-polarized tunneling in MgO-based tunnel junctions with superconducting electrodes

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Abstract

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 Co 2FeAl. 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. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.

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Schebaum, O., Fabretti, S., Moodera, J. S., & Thomas, A. (2012). Spin-polarized tunneling in MgO-based tunnel junctions with superconducting electrodes. New Journal of Physics, 14. https://doi.org/10.1088/1367-2630/14/3/033023

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