Coexistence of superconductivity and ferromagnetism in ferromagnet/superconductor proximity structures |
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| Authors: | Sun Guoya Xing DY Shen R Lin HQ |
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| Institution: | (1) National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, PR China, CN;(2) Department of Physics, The Chinese University of Hong Kong, Hong Kong, PR China, HK |
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| Abstract: | The Nambu spinor Green's function approach is applied to calculating the density of states (DOS) and superconducting order
parameter in normal-metal/insulator/ferromagnet/superconductor (NM/I/FM/SC) junctions. It is found that the s-wave superconductivity and ferromagnetism can coexist near the FM/SC interface, which is induced by proximity effect. On
the SC side, the spin-dependent DOS appears both within and without the energy gap. On the FM side, the superconducting order
parameter displays a damped oscillation and the DOS exhibits some superconducting behavior. The calculated result for the
DOS in FM for “0 state” and “π state” can reproduce recent tunneling spectra in Al/Al2O3/PdNi/Nb tunnel junctions.
Received 1st July 2002 Published online 19 November 2002 |
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| Keywords: | PACS 74 50 +r Proximity effects weak links tunneling phenomena and Josephson effects – 74 80 Fp Point contacts SN and SNS junctions – 74 80 -g Spatially inhomogeneous structures |
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