Spin-valve magnetic sandwich in a Josephson junction
Spin-valve magnetic sandwich in a Josephson junction
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约瑟夫森结中的旋转阀磁性夹层
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
N. Ryzhanova
中科院分区：
文献类型：
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作者：
A. Vedyayev;C. Lacroix;N. Pugach;N. Ryzhanova
计算了SFNS结中的约瑟夫森电流，该结由两个铁磁层(F)组成，两个铁磁层(F)由一个薄的非磁性隔离物(N)隔开并连接到超导电极(S)。考虑到S-d散射是三维铁磁金属的主要散射机制，有效地破坏了BCS关联，求解了Gorkov方程。它允许我们考虑强和弱交换场I：Iτf>；>；1或Iτf<；<；1(τf是F层中的驰豫时间)。结果表明，临界电流J作为F层厚度的函数振荡，振荡周期仅与I有关。S-d散射有效地作为交换磁场机制的补充，抑制了铁磁体中的BCS关联。S-d散射是抑制反平行位形约瑟夫森电流增强的原因。
The Josephson current is calculated in a SFNFS junction, which consists of two ferromagnetic layers (F) separated by a thin non-magnetic spacer (N) and connected to superconducting electrodes (S). Gorkov equations are solved taking into account the fact that s-d scattering is the main scattering mechanism in the 3d ferromagnetic metals and it effectively destroys BCS correlation. It allows us to consider both strong and weak exchange field I: Iτf >> 1 or Iτf << 1 (τf is the relaxation time in F-layers). It is shown that the critical current J oscillates as a function of F-layers thickness and the oscillation period depends only on I. The s-d scattering effectively acts as an additional to the exchange magnetic-field mechanism for the suppression of BCS correlation in the ferromagnet. The s-d scattering is shown to be the reason of suppression of the Josephson current enhancement in the antiparallel configuration.