In:
Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 0, No. 0 ( 2023), p. 0-
Abstract:
Based on the Bogoliubov-de Gennes equations, we investigate the transport of the Josephson current in a onedimensional S/F〈sub〉L〈/sub〉-F-F〈sub〉R〈/sub〉/S junction, where S and F are superconductor and ferromagnet, and F〈sub〉L,R〈/sub〉 are the left and right interfaces with noncollinear magnetizations. It is found that the F〈sub〉L〈/sub〉 and F〈sub〉R〈/sub〉 interfaces can induce spin-mixing and spinF〈sub〉L〈/sub〉ip effects, which can transform a part of spin-singlet pairs in the S into equal-spin triplet pairs in the F. For the short S/F〈sub〉L〈/sub〉-F-F〈sub〉R〈/sub〉/S junction, the spin-singlet pairs and the equal-spin triplet pairs can survive in the F layer. Therefore, with the increase of the ferromagnetic exchange field and the angle difference of interface magnetization rotation, the critical current oscillates on a base level. If the F is transformed into half-metal, only the equal-spin triple pairs exist in the F layer, and the oscillation characteristic of critical current disappears. In addition, the F〈sub〉L〈/sub〉 and F〈sub〉R〈/sub〉 interfaces can work as conventional potential barriers. As a result, the critical current exhibits double oscillation behaviors with the increase of ferromagnetic thickness, in which the long-wave oscillation arises From the phase change of the spin-singlet pairs in the ferromagnetic layer, and the short-wave oscillation is caused by the resonant tunneling effect when the spin-singlet pairs and the equal-spin triplet pairs pass through two interfacial barriers.
Type of Medium:
Online Resource
ISSN:
1000-3290
,
1000-3290
DOI:
10.7498/aps.72.20231008
Language:
Unknown
Publisher:
Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
Publication Date:
2023
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