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Inverse proximity effect and influence of disorder on triplet supercurrents in strongly spin-polarized ferromagnets

机译:反自旋效应和无序对强自旋极化铁磁体中三重态超电流的影响

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摘要

We discuss the Josephson effect in strongly spin-polarized ferromagnets where triplet correlations are induced by means of spin-active interface scattering, extending our earlier work [R. Grein, M. Eschrig, G. Metalidis, and G. Schon, Phys. Rev. Lett. 102, 227005 (2009)] by including impurity scattering in the ferromagnetic bulk and the inverse proximity effect in a fully self-consistent way. Our quasiclassical approach accounts for the differences of Fermi momenta and Fermi velocities between the two spin bands of the ferromagnet, and thereby overcomes an important shortcoming of previous work within the framework of Usadel theory. We show that nonmagnetic disorder in conjunction with spin-dependent Fermi velocities may induce a reversal of the spin current as a function of temperature.
机译:我们讨论强自旋极化铁磁体中的约瑟夫森效应,其中通过自旋-活性界面散射来诱导三重态相关性,扩展了我们先前的工作[R。 Grein,M。Eschrig,G。Metalidis和G. Schon,物理。牧师102,227005(2009)]以完全自洽的方式将杂质散射包括在铁磁体中,并实现了反邻近效应。我们的准经典方法解决了铁磁体两个自旋带之间的费米矩和费米速度的差异,从而克服了先前在Usadel理论框架内所做工作的重要缺点。我们表明,与自旋相关的费米速度相结合的非磁性紊乱可能会导致自旋电流随温度的变化而逆转。

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