Spin filtering through ferrimagnetic NiFe2O4 tunnel barriers

We report experiments of spin-filtering through ultrathin insulating layers of the high Curie temperature ferrimagnetic oxide NiFe2O4 (NFO). The spin-filtering efficiency of electrons tunneling from a gold electrode through NFO is analyzed with a counter-electrode of La2∕3Sr1∕3MnO3 (LSMO). We measur...

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Bibliographic Details
Published in:Applied physics letters 2006-02, Vol.88 (8)
Main Authors: Lüders, U., Bibes, M., Bouzehouane, K., Jacquet, E., Contour, J.-P., Fusil, S., Bobo, J.-F., Fontcuberta, J., Barthélémy, A., Fert, A.
Format: Article
Language:English
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Summary:We report experiments of spin-filtering through ultrathin insulating layers of the high Curie temperature ferrimagnetic oxide NiFe2O4 (NFO). The spin-filtering efficiency of electrons tunneling from a gold electrode through NFO is analyzed with a counter-electrode of La2∕3Sr1∕3MnO3 (LSMO). We measure a tunnel magnetoresistance of 40%–50% when the configuration of the magnetizations of the NFO and LSMO goes from parallel to antiparallel. This value corresponds to a spin-filtering efficiency of up to 22% by the NFO barrier. We discuss the sign and temperature dependence of the spin-filter effect and argue that our results show the potential of spinel ferrites for spin-filtering and injection.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2172647