论文标题
铁磁混合纳米线约瑟夫森连接处的超流动逆转
Supercurrent reversal in ferromagnetic hybrid nanowire Josephson junctions
论文作者
论文摘要
我们报告了由半导体INAS纳米线组成的杂交约瑟夫森连接中的超电流传输测量值，并具有外延铁磁性绝缘子EUS和超导涂层。电线在远离零外部磁场的牢固的牢固窗口上显示一个滞后超导窗口。使用多型式仪表设置，我们测量了多个磁性连接的电流相关关系，并在超导窗口内找到$π$和0阶段之间的突然开关。我们将0- $π$转换归因于EUS域的离散翻转，并提供了定性理论，表明相当大的交换场可以极化连接点并导致超高级反转。 $ 0 $和$π$阶段都可以通过消除电线来实现零外部字段。
We report supercurrent transport measurements in hybrid Josephson junctions comprised of semiconducting InAs nanowires with epitaxial ferromagnetic insulator EuS and superconducting Al coatings. The wires display a hysteretic superconducting window close to the coercivity, away from zero external magnetic field. Using a multi-interferometer setup, we measure the current-phase relation of multiple magnetic junctions and find an abrupt switch between $π$ and 0 phases within the superconducting window. We attribute the 0-$π$ transition to the discrete flipping of the EuS domains and provide a qualitative theory showing that a sizable exchange field can polarize the junction and lead to the supercurrent reversal. Both $0$ and $π$ phases can be realized at zero external field by demagnetizing the wire.
