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Spin filtering through ferromagnetic BiMnO3 tunnel barriers
Gajek, M.; Bibes, Manuel; Barthelemy, A.; Bouzehouane, K.; Fusil, S.; Varela Fernández, Manuel, 1956-; Fontcuberta i Griñó, Josep; Fert, Albert, 1938-
Universitat de Barcelona
We report on experiments of spin filtering through ultrathin single-crystal layers of the insulating and ferromagnetic oxide BiMnO3 (BMO). The spin polarization of the electrons tunneling from a gold electrode through BMO is analyzed with a counterelectrode of the half-metallic oxide La2/3Sr1/3MnO3 (LSMO). At 3 K we find a 50% change of the tunnel resistances according to whether the magnetizations of BMO and LSMO are parallel or opposite. This effect corresponds to a spin-filtering efficiency of up to 22%. Our results thus show the potential of complex ferromagnetic insulating oxides for spin filtering and injection.
2010-05-04
Materials
Propietats magnètiques
Física de l'estat sòlid
Magnetic properties and materials
Electron and ion emission by liquids and solids
(c) The American Physical Society, 2005
Article
The American Physical Society
         

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