Journal
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
Volume 26, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-2048/26/1/015005
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Funding
- Russian Foundation for Basic Research [12-02-90010-Bel-a, 11-02-12065-ofi-m]
- Russian Ministry of Education and Science [N8746]
- Dynasty Foundation
- Dutch FOM
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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.
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