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Nucleation of Superconducting Domains in Thin s-layers of S-F/N-sIS Josephson Devices

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Nucleation of Superconducting Domains in Thin s-layers of S-F/N-sIS Josephson Devices

 
S. V. Bakurskiy1,2,3, N. V. Klenov1,2,3, I. I. Soloviev1,2,3, M. Yu. Kupriyanov1,3, and A. A. Golubov3,4
 
1Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Leninskie gory, Moscow 119991, Russian Federation
2Faculty of Physics, Lomonosov Moscow State University, Leninskie gory, Moscow 119992, Russian Federation
3Moscow Institute of Physics and Technology, Dolgoprudny,Moscow Region, 141700, Russian Federation
4Faculty of Science and Technology and MESA+ Institute for Nanotechnology, University of Twente, 7500 AE Enschede, The Netherlands
 
Abstract — In this work we study theoretically the properties of S-F/N-sIS tunnel devices in the frame of the Usadel formalism. We demonstrate that in the S-F/N-sIS device it is possible to achieve its separation into two regions which have positive and negative critical current densities. We prove by numerical calculations that this separation is accompanied by a new phenomenon, namely the violation of a spatial uniformity of the superconductive film and its decomposition into domains with an order parameter phase difference equal to π. The effect is sensitive to thickness of the s layer and widths of F and N films in the direction along the sIS interface. We found that in the crossover regime the S-F/N-sIS device may have two metastable states and can be switched between these states by current induced in the s film. Finally, the state of the system can be nondestructively read by current injected through the S electrodes.
 
Keywords (Index Terms) — Superconductivity, ferromagnetism, electronics, Josephson Junction, hybrid structures, memory.
 
IEEE/CSC & ESAS SUPERCONDUCTIVITY NEWS FORUM (global edition), October 2015. Submitted September 21, 2015; Selected September 26, 2015. Reference No. STP464; Category 4. EUCAS 2015 poster 3A-E-P-04.04. EUCAS Young Investigator Prize 2015 in Electronics. Not submitted to IEEE Trans. Appl. Supercond.