Superconductor-ferromagnet-superconductor Josephson junctions are known to exist in the 0 and π states with the transitions between them controlled by the temperature and ferromagnetic interlayer thickness. We demonstrate that these transitions can be controlled also by the external magnetic field directed perpendicular to the layers. By varying the ratio of diffusion coefficients in superconducting and ferromagnetic layers, these field-controlled transitions can be made detectable for arbitrary large values of the exchange energy in the ferromagnet. We also show that the transitions in the perpendicular field can be observed as the specific features of the flux-flow conductivity dependencies on the ferromagnetic thickness in accordance with recent experimental results.
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2 March 2020
Research Article|
March 02 2020
Magnetic field-controlled transitions and their experimental signatures in superconductor-ferromagnet-superconductor junctions
A. Vargunin
;
A. Vargunin
1
Department of Physics and Nanoscience Center, University of Jyväskylä
, P.O. Box 35 (YFL), Jyväskylä FI-40014, Finland
2
Institute of Physics, University of Tartu
, Tartu EE-50411, Estonia
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M. A. Silaev
M. A. Silaev
a)
1
Department of Physics and Nanoscience Center, University of Jyväskylä
, P.O. Box 35 (YFL), Jyväskylä FI-40014, Finland
3
Moscow Institute of Physics and Technology
, Dolgoprudny 141700, Russia
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a)
Author to whom correspondence should be addressed: [email protected]
Appl. Phys. Lett. 116, 092601 (2020)
Article history
Received:
December 23 2019
Accepted:
February 14 2020
Citation
A. Vargunin, M. A. Silaev; Magnetic field-controlled transitions and their experimental signatures in superconductor-ferromagnet-superconductor junctions. Appl. Phys. Lett. 2 March 2020; 116 (9): 092601. https://doi.org/10.1063/1.5143269
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