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Andreev current and subgap conductance of spin-valve SFF structures

AuthorsVasenko, A. S.; Ozaeta, A.; Kawabata, Shiro; Hekking, F. W. J.; Bergeret, F. S.
KeywordsAndreev current
Ferromagnetic domains
Proximity effect
Issue Date2013
CitationJournal of Superconductivity and Novel Magnetism 26(5): 1951-1956 (2013)
AbstractThe Andreev current and the subgap conductance in a superconductor/insulator/ferromagnet (SIF) structure in the presence of a small spin-splitting field show novel interesting features (Ozaeta et al. in Phys. Rev. B 86:060509(R), 2012). For example, the Andreev current at zero temperature can be enhanced by a spin-splitting field h, smaller than the superconducting gap Δ, as has been recently reported by the authors. Also at finite temperatures, the Andreev current has a peak for values of the spin-splitting field close to the superconducting gap, h≈Δ. Finally, the differential subgap conductance at low temperatures shows a peak at the bias voltage eV=h. In this paper, we investigate the Andreev current and the subgap conductance in SFF structures with arbitrary direction of magnetization of the F layers. We show that all the aforementioned features occur now at the value of the “effective field”, which is the field acting on the Cooper pairs in the multi-domain ferromagnetic region, averaged over the decay length of the superconducting condensate into a ferromagnet. We also briefly discuss the heat transport and electron cooling in the considered structures.
Publisher version (URL)http://dx.doi.org/10.1007/s10948-012-2044-9
Identifiersdoi: 10.1007/s10948-012-2044-9
issn: 1557-1939
e-issn: 1557-1947
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