Enhanced supercurrents in Josephson junctions containing nonparallel ferromagnetic domains.
Enhanced supercurrents in Josephson junctions containing nonparallel ferromagnetic domains.
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DOI：
10.1103/physrevlett.104.207001
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发表时间：
2010-05
影响因子：
8.6
通讯作者：
J. Robinson;G. Halász;A. Buzdin;M. Blamire
中科院分区：
文献类型：
--
作者：
J. Robinson;G. Halász;A. Buzdin;M. Blamire
当铁磁体在人造约瑟夫森结的两个超导体之间形成链接时，π耦合可能出现。使用三层Fe/Cr/Fe屏障，其中Cr的厚度决定的Fe层的对齐，我们表明，临界电流大大增强的反平行配置。该结果与现有的超导体-铁磁体邻近理论一致，根据该理论，铁磁体对库珀对的相位控制效应可以通过以非平行的方式排列它们的矩来最小化[Bergeret，Phys. Rev. Lett. 86，3140（2001）; Blanter，Phys. Rev. B 69，024525（2004）]。
π coupling may arise when a ferromagnet forms a link between two superconductors of an artificial Josephson junction. Using a trilayer Fe/Cr/Fe barrier in which the Cr thickness determines the alignment of the Fe layers, we show that the critical currents are substantially enhanced in the antiparallel configuration. The result agrees with existing superconductor-ferromagnet proximity theory according to which the phase-controlling effects of ferromagnets on Cooper pairs can be minimized by arranging their moments in a nonparallel way [Bergeret, Phys. Rev. Lett. 86, 3140 (2001); Blanter, Phys. Rev. B 69, 024525 (2004)].