Journal
PHYSICAL REVIEW B
Volume 81, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.174415
Keywords
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Funding
- Ministerio de Ciencia e Innovacion of the Spanish Government [MAT2008-06761-C03, NANOSELECT CSD2007-00041]
- Generalitat de Catalunya [2009-SGR-00376]
- European Union [FP6-03321]
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We have performed point-contact spectroscopy measurements on a sample constituted by a metallic ferromagnetic oxide (SrRuO3) bottom electrode and a tunnel ferrimagnetic (CoFe2O4) barrier. Andreev reflection is observed across the tunnel barrier. From the comparison of Andreev reflection in SrRuO3 and across the CoFe2O4 barrier we infer that the ferrimagnetic barrier has a spin filter efficiency not larger than +13%. The observation of a moderate and positive spin filtering is discussed in the context of the microstructure of the barriers and symmetry-related spin-filtering effects.
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