Josephson φ-junctions based on structures with complex normal/ferromagnet bilayer

被引：33

作者：

Bakurskiy, S. V. ^{[1
,2
]}

Klenov, N. V. ^{[1
]}

Karminskaya, T. Yu ^{[2
]}

Kupriyanov, M. Yu ^{[2
]}

Golubov, A. A. ^{[3
,4
]}

机构：

[1] Moscow MV Lomonosov State Univ, Fac Phys, Moscow 119991, Russia

[2] Lomonosov Moscow State Univ 1 2, Skobeltsyn Inst Nucl Phys, Moscow 119991, Russia

[3] Univ Twente, Fac Sci & Technol, NL-7500 AE Enschede, Netherlands

[4] Univ Twente, MESA Inst Nanotechnol, NL-7500 AE Enschede, Netherlands

来源：

SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 2013年 / 26卷 / 01期

基金：

俄罗斯基础研究基金会;

关键词：

CURRENT-PHASE RELATION; WEAK LINKS; EXCHANGE FIELD; PI-JUNCTION; FERROMAGNET; FLUX; HETEROSTRUCTURES; FABRICATION; SHIFTERS; LAYER;

D O I：

10.1088/0953-2048/26/1/015005

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We demonstrate that Josephson devices with a nontrivial phase difference 0 < phi(g) < pi in the ground state can be realized in structures composed of longitudinally oriented normal metal (N) and ferromagnet (F) films in the weak link region. Oscillatory coupling across the F-layer makes the first harmonic in the current-phase relation relatively small, while coupling across the N-layer provides a negative sign of the second harmonic. To derive quantitative criteria for a phi-junction, we have solved the two-dimensional boundary-value problem in the frame of Usadel equations for overlap and ramp geometries of S-NF-S structures. Our numerical estimates show that phi-junctions can be fabricated using up-to-date technology.

引用

页数：15

共 79 条

[1] Long range supercurrents in ferromagnetic CrO2 using a multilayer contact structure [J].

Anwar, M. S. ;

Veldhorst, M. ;

Brinkman, A. ;

Aarts, J. .

APPLIED PHYSICS LETTERS, 2012, 100 (05)

[2] 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)

[3] Current-Phase Relation in Josephson Junctions with Complex Ferromagnetic/Normal Metal Interlayers [J].

Bakurskiy, S. V. ;

Klenov, N. V. ;

Karminskaya, T. Yu. ;

Kupriyanov, M. Yu. ;

Kornev, V. K. .

MAGNETISM AND MAGNETIC MATERIALS V, 2012, 190 :401-+

[4] Characteristics of strong ferromagnetic Josephson junctions with epitaxial barriers [J].

Bell, C ;

Loloee, R ;

Burnell, G ;

Blamire, MG .

PHYSICAL REVIEW B, 2005, 71 (18)

[5] Enhancement of the Josephson current by an exchange field in superconductor-ferromagnet structures [J].

Bergeret, FS ;

Volkov, AF ;

Efetov, KB .

PHYSICAL REVIEW LETTERS, 2001, 86 (14) :3140-3143

[6] Critical current in Nb-Cu-Nb junctions with nonideal interfaces [J].

Blum, Y ;

Tsukernik, A ;

Karpovski, M ;

Palevski, A .

PHYSICAL REVIEW B, 2004, 70 (21) :1-4

[7] Multiple 0-π transitions in superconductor/insulator/ferromagnet/superconductor Josephson tunnel junctions [J].

Born, F. ;

Siegel, M. ;

Hollmann, E. K. ;

Braak, H. ;

Golubov, A. A. ;

Gusakova, D. Yu. ;

Kupriyanov, M. Yu. .

PHYSICAL REVIEW B, 2006, 74 (14)

[8] Domain wall effects in ferromagnet-superconductor structures [J].

Burmistrov, IS ;

Chtchelkatchev, NM .

PHYSICAL REVIEW B, 2005, 72 (14)

[9] Periodic alternating 0- and π-junction structures as realization of Φ-Josephson junctions -: art. no. 220504 [J].

Buzdin, A ;

Koshelev, AE .

PHYSICAL REVIEW B, 2003, 67 (22)

[10] π-Junction realization due to tunneling through a thin ferromagnetic layer [J].

Buzdin, A .

JETP LETTERS, 2003, 78 (09) :583-586

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