Andreev reflection in ferrimagnetic CoFe2O4/SrRuO3 spin filters

Details Andreev reflection in ferrimagnetic CoFe2O4/SrRuO3 spin filters Andreev reflection in ferrimagnetic CoFe2O4/SrRuO3 spin filters

2010-04-26

arxiv.org/abs/1004.4631v1

Phys. Rev. B 81, 174415 (2010)

Physics

Condensed Matter

Materials Science

13 pages, 5 figures. To appear in Phys. Rev. B.

Scientific paper

10.1103/PhysRevB.81.174415

We have performed point contact spectroscopy measurements on a sample constituted by a metallic ferromagnetic oxide (SrRuO_3) bottom electrode and a tunnel ferrimagnetic (CoFe_2O_4) barrier. Andreev reflection is observed across the tunnel barrier. From the comparison of Andreev reflection in SrRuO3 and across the CoFe_2O_4 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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