摘要We investigate an antiferromagnet/ferromagnet/superconductor/ferromagnet (AF/F/S/F) spin-valve system with nanoscopic scale, described by Usadel equations in the dirty limit. The results show that the superconducting characteristics in the system strongly depend not only on the mutual orientation and thickness of two ferromagnetic layers, but also on the interface transparency and the magnetic scattering. The superconducting critical temperature can exhibit three types of characteristic behaviors with a variation of interface transparency. In particular, the reentrance phenomenon of the superconductivity is observed at the interface transparency γB ξn /ξf =7.1, while the reentrance phenomenon disappears in the presence of magnetic scattering. In addition, it is also found that the introduction of magnetic scattering results in the decrease of the spin-valve effect. The obtained results could provide some practical recommendations for the spin-valve effect in experimental observation.
Abstract：We investigate an antiferromagnet/ferromagnet/superconductor/ferromagnet (AF/F/S/F) spin-valve system with nanoscopic scale, described by Usadel equations in the dirty limit. The results show that the superconducting characteristics in the system strongly depend not only on the mutual orientation and thickness of two ferromagnetic layers, but also on the interface transparency and the magnetic scattering. The superconducting critical temperature can exhibit three types of characteristic behaviors with a variation of interface transparency. In particular, the reentrance phenomenon of the superconductivity is observed at the interface transparency γB ξn /ξf =7.1, while the reentrance phenomenon disappears in the presence of magnetic scattering. In addition, it is also found that the introduction of magnetic scattering results in the decrease of the spin-valve effect. The obtained results could provide some practical recommendations for the spin-valve effect in experimental observation.
PENG Lin**;LIU Yong-Sheng;CAI Chuan-Bing;ZHANG Jin-Cang
. Influence of Magnetic Scattering and Interface Transparency on Superconductivity Based on a Ferromagnet/Superconductor Heterostructure[J]. 中国物理快报, 2011, 28(8): 87401-087401.
PENG Lin**, LIU Yong-Sheng, CAI Chuan-Bing, ZHANG Jin-Cang
. Influence of Magnetic Scattering and Interface Transparency on Superconductivity Based on a Ferromagnet/Superconductor Heterostructure. Chin. Phys. Lett., 2011, 28(8): 87401-087401.
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2011, Vol. 28 
