Magnetic josephson junctions with superconducting interlayer for cryogenic memory

Vernik, I.V.; Bol’Ginov, V.V.; Bakurskiy, S.V.; Golubov, A.A.; Kupriyanov, M.Y.; Ryazanov, V.V.; Mukhanov, O.A.

Авторы: Vernik I.V., Bol’Ginov V.V., Bakurskiy S.V., Golubov A.A., Kupriyanov M.Y., Ryazanov V.V., Mukhanov O.A.
Журнал: IEEE Transactions on Applied Superconductivity
Том: 23
Номер: 3
Год издания: 2013
Издательство: Institute of Electrical and Electronics Engineers
Местоположение издательства: Piscataway, NJ, United States
Первая страница: 1701208-1
Последняя страница: 1701208-8
DOI: 10.1109/TASC.2012.2233270
Аннотация: We investigate a Magnetic Josephson Junction (MJJ) - a superconducting device with ferromagnetic barrier for a scalable high-density cryogenic memory compatible with energy-efficient single flux quantum (SFQ) circuits. The superconductor-insulator-superconductor-ferromagnet-superconductor (SISвЂІFS) MJJs are analyzed both experimentally and theoretically. We found that the properties of SISвЂІFS junctions fall into two distinct classes based on the thickness of SвЂІ layer. We fabricate Nb-Al/AlOx-Nb-PdFe-Nb SISвЂІFS MJJs using a co-processing approach with a combination of HYPRES and ISSP fabrication processes. The resultant SISвЂІFS structure with thin superconducting SвЂІ-layer is substantially affected by the ferromagnetic layer as a whole. We fabricate these type of junctions to reach the device compatibility with conventional SIS junctions used for superconducting SFQ electronics to ensure a seamless integration of MJJ-based circuits and SIS JJ-based ultra-fast digital SFQ circuits. We report experimental results for MJJs, demonstrating their applicability for superconducting memory and digital circuits. These MJJs exhibit IcRn product only в€ј30% lower than that of conventional SIS junctions co-produced in the same fabrication. Analytical calculations for these SISвЂІFS structures are in a good agreement with the experiment. We discuss application of MJJ devices for memory and programmable logic circuits. В© 2002-2011 IEEE.
Добавил в систему: Куприянов Михаил Юрьевич

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