Andreev reflection in ferrimagnetic CoFe2O4/SrRuO3 spin filters
Materials Science
2010-08-12 v1
Abstract
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.
Cite
@article{arxiv.1004.4631,
title = {Andreev reflection in ferrimagnetic CoFe2O4/SrRuO3 spin filters},
author = {Franco Rigato and Samanta Piano and Michael Foerster and Filippo Giubileo and Anna Maria Cucolo and Josep Fontcuberta},
journal= {arXiv preprint arXiv:1004.4631},
year = {2010}
}
Comments
13 pages, 5 figures. To appear in Phys. Rev. B.