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We perform an ab initio study of spin-polarized tunneling in epitaxial CojSrTiO3jCo magnetic tunnel junctions with bcc Co(001) electrodes. We predict a large tunneling magnetoresistance in these junctions, originating from a mismatch in the majority- and minority-spin bands both in bulk bcc Co and at the CojSrTiO3 interface. The intricate complex band structure of SrTiO3 enables efficient tunneling of the minority d electrons which causes the spin polarization of the CojSrTiO3 interface to be negative in agreement with experimental data. Our results indicate that epitaxial CojSrTiO3jCo magnetic tunnel junctions with bcc Co(001) electrodes are a viable alternative for device applications.

physical review letters

Negative Spin Polarization and Large Tunneling Magnetoresistance in Epitaxial<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Co</mml:mi><mml:mo stretchy="false">|</mml:mo><mml:msub><mml:mi>SrTiO</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mo stretchy="false">|</mml:mo><mml:mi>Co</mml:mi></mml:math>Magnetic Tunnel Junctions

Negative Spin Polarization and Large Tunneling Magnetoresistance in EpitaxialCo|SrTiO3|CoMagnetic Tunnel Junctions