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Optimization of spin-triplet supercurrent in ferromagnetic Josephson junctions

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arxiv 1108.5666 v1 pith:F6WZXA4X submitted 2011-08-29 cond-mat.supr-con cond-mat.mes-hall

Carolin Klose , Trupti S. Khaire , Yixing Wang , W. P. Pratt , Jr. , Norman O. Birge , B.J. McMorran , T.P. Ginley
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J.A. Borchers B.J. Kirby B.B. Maranville J. Unguris
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classification cond-mat.supr-concond-mat.mes-hall
keywords spin-tripletmagnetizationssupercurrentevidenceferromagneticjosephsonjunctionslayers
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In the past year, several groups have observed evidence for long-range spin-triplet supercurrent in Josephson junctions containing ferromagnetic (F) materials. In our work, the spin-triplet pair correlations are created by non-collinear magnetizations between a central Co/Ru/Co "synthetic antiferromagnet" (SAF) and two outer thin F layers. Here we present data showing that the spin-triplet supercurrent is enhanced up to 20 times after our samples are subject to a large in-plane magnetizing field. This surprising result can be explained if the Co/Ru/Co SAF undergoes a "spin-flop" transition, whereby the two Co layer magnetizations end up perpendicular to the magnetizations of the two thin F layers. Direct experimental evidence for the spin-flop transition comes from scanning electron microscopy with polarization analysis and from spin-polarized neutron reflectometry.

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  1. Quantized resonant tunneling effect in Josephson junctions with ferromagnetic bilayers

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    In 1D SF1F2S Josephson junctions, a barrier at the F1/F2 interface creates critical-current resonance peaks at Q_i d_i = (n_i + 1/2)π, attributed to zero-spin-projection triplet pairs, with accumulated phase setting t...

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