Exotic Proximity Effects in Superconductor/Ferromagnet Structure
Abstract
We study a possibility to obtain a new type of superconductivity (swave, triplet, odd in Matsubara frequencies) in superconductor/ferromagnet (S/F) structures. A special attention is paid to multilayered S/F structures with the magnetization vector inclined in neighboring F layers by an angle a. It is shown that not only a singlet, but also triplet component exists in the structure which penetrates into the F layers over a long distance. The longrange penetration of the triplet component insures the Josephson coupling. The sign of the Josephson coupling between the nearest S layers (Sand S _{+1}) depends on chirality of the system, i.e., on sign of the product α α α _{+1}. Therefore inplane superconductivity in the structure is caused by the singlet component and transverse superconductivity is due to the triplet component (odd superconductivity). We also study ferromagnetism induced in the superconductor due to the inverse proximity effect. It turns out that the magnetization M induced in S is opposite to M in the ferromagnet and spreads over a distance of order of the correlation length.
 Publication:

Fundamental Problems of Mesoscopic Physics: Interactions and Decoherence
 Pub Date:
 2004
 DOI:
 10.1007/1402021933_15
 Bibcode:
 2004fpmp.book..251B
 Keywords:

 Physics