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

共 24 条

[1] Long-range supercurrents through half-metallic ferromagnetic CrO2 [J].

Anwar, M. S. ;

Czeschka, F. ;

Hesselberth, M. ;

Porcu, M. ;

Aarts, J. .

PHYSICAL REVIEW B, 2010, 82 (10)

[2] Josephson current in superconductor-ferromagnet structures with a nonhomogeneous magnetization [J].

Bergeret, FS ;

Volkov, AF ;

Efetov, KB .

PHYSICAL REVIEW B, 2001, 64 (13)

[3] Long-range proximity effects in superconductor-ferromagnet structures [J].

Bergeret, FS ;

Volkov, AF ;

Efetov, KB .

PHYSICAL REVIEW LETTERS, 2001, 86 (18) :4096-4099

[4] Observation of antiparallel magnetic order in weakly coupled Co/Cu multilayers [J].

Borchers, JA ;

Dura, JA ;

Unguris, J ;

Tulchinsky, D ;

Kelley, MH ;

Majkrzak, CF ;

Hsu, SY ;

Loloee, R ;

Pratt, WP ;

Bass, J .

PHYSICAL REVIEW LETTERS, 1999, 82 (13) :2796-2799

[5] Josephson effect through a ferromagnetic layer [J].

Bourgeois, O ;

Gandit, P ;

Lesueur, J ;

Sulpice, A ;

Grison, X ;

Chaussy, J .

EUROPEAN PHYSICAL JOURNAL B, 2001, 21 (01) :75-80

[6] Proximity effects in superconductor-ferromagnet heterostructures [J].

Buzdin, AI .

REVIEWS OF MODERN PHYSICS, 2005, 77 (03) :935-976

[7] Superconducting proximity effects in magnetic metals [J].

Demler, EA ;

Arnold, GB ;

Beasley, MR .

PHYSICAL REVIEW B, 1997, 55 (22) :15174-15182

[8] Theory of half-metal/superconductor heterostructures -: art. no. 137003 [J].

Eschrig, M ;

Kopu, J ;

Cuevas, JC ;

Schön, G .

PHYSICAL REVIEW LETTERS, 2003, 90 (13) :4

[9] Long range triplet Josephson effect through a ferromagnetic trilayer [J].

Houzet, M. ;

Buzdin, A. I. .

PHYSICAL REVIEW B, 2007, 76 (06)

[10] Quantum spin fluctuations as a source of long-range proximity effects in diffusive ferromagnet-superconductor structures [J].

Kadigrobov, A ;

Shekhter, RI ;

Jonson, M .

EUROPHYSICS LETTERS, 2001, 54 (03) :394-400

← 1 2 3 →