Optimization of Spin-Triplet Supercurrent in Ferromagnetic Josephson Junctions

被引：114

作者：

Klose, Carolin ^{[1
]}

Khaire, Trupti S. ^{[1
]}

Wang, Yixing ^{[1
]}

Pratt, W. P., Jr. ^{[1
]}

Birge, Norman O. ^{[1
]}

McMorran, B. J. ^{[2
]}

Ginley, T. P. ^{[2
]}

Borchers, J. A. ^{[2
]}

Kirby, B. J. ^{[2
]}

Maranville, B. B. ^{[2
]}

Unguris, J. ^{[2
]}

机构：

[1] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA

[2] Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 12期

关键词：

HETEROSTRUCTURES;

D O I：

10.1103/PhysRevLett.108.127002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have observed long-range spin-triplet supercurrents in Josephson junctions containing ferromagnetic (F) materials, which are generated by noncollinear magnetizations between a central Co/Ru/Co synthetic antiferromagnet and two outer thin F layers. Here we show that the spin-triplet supercurrent is enhanced up to 20 times after our samples are subject to a large in-plane field. This occurs because the synthetic antiferromagnet undergoes a "spin-flop'' transition, whereby the two Co layer magnetizations end up nearly perpendicular to the magnetizations of the two thin F layers. We report direct experimental evidence for the spin-flop transition from scanning electron microscopy with polarization analysis and from spin-polarized neutron reflectometry. These results represent a first step toward experimental control of spin-triplet supercurrents.

引用

页数：5

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