Abstract We extend the Blonder, Tinkham and Klapwijk (BTK) theory to the study of the coexistence between ferromagnetism and s-wave superconductivity in ferromagnet/superconductor (F/S) structures. It is found that the ferromagnetism and s-wave superconductivity can coexist near the F/S interface, which is induced by proximity effects. On the F side, the density of states (DOS) exhibits some superconducting-like properties, and it displays a damped oscillation from `0' to `$\pi$' states with increasing either the thickness of F film or the exchange energy. We also study the influences of the spin-polarized exchange splitting in the F and the spin-degeneracy by Rashba spin--orbit coupling (RSOC) in the two-dimensional electron gas (2DGE) on the proximity effects. It is shown that the case of Rashba spin-degeneracy is very different from that of the spin-polarized exchange splitting.
Received: 03 March 2007
Revised: 16 April 2007
Accepted manuscript online:
PACS:
74.45.+c
(Proximity effects; Andreev reflection; SN and SNS junctions)
Fund: Project supported by the Natural
Science Foundation of Education Bureau of Jiangsu Province, China
(Grant No 05KJB140008), and the Program for Excellent Talents in
Huaiyin Teachers College, China.
Cite this article:
Yu Hua-Ling(郁华玲) and Dong Zheng-Chao(董正超) Proximity effects in normal mental/spin-splitting material/superconductor junctions 2007 Chinese Physics 16 3072
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