Area-dependence of spin-triplet supercurrent in ferromagnetic Josephson junctions

In 2010, several experimental groups obtained compelling evidence for spin-triplet supercurrent in Josephson junctions containing strong ferromagnetic materials. Our own best results were obtained from large-area junctions containing a thick central Co/Ru/Co “synthetic antiferromagnet” and two thin...

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Bibliographic Details
Published in:Journal of physics. Conference series 2012-01, Vol.400 (2), p.22131-6
Main Authors: Wang, Yixing, Jr, W P Pratt, Birge, Norman O
Format: Article
Language:English
Subjects:
Antiferromagnetism
Critical current (superconductivity)
Ferromagnetic materials
Ferromagnetism
Josephson junctions
Local current
Nickel base alloys
Physics
Position measurement
Thin films
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Summary:In 2010, several experimental groups obtained compelling evidence for spin-triplet supercurrent in Josephson junctions containing strong ferromagnetic materials. Our own best results were obtained from large-area junctions containing a thick central Co/Ru/Co “synthetic antiferromagnet” and two thin outer layers made of Ni or PdNi alloy. Because the ferromagnetic layers in our samples are multi-domain, one would expect the sign of the local current-phase relation inside the junctions to vary randomly as a function of lateral position. Here we report measurements of the area dependence of the critical current in several samples, where we find some evidence for those random sign variations. When the samples are magnetized, however, the critical current becomes clearly proportional to the area, indicating that the current-phase relation has the same sign across the entire area of the junctions.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/400/2/022131