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  • 1.
    Golod, Taras
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Hovhannisyan, Razmik A.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Moscow Institute of Physics and Technology, Russia.
    Kapran, Olena M.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Dremov, Vyacheslav V.
    Stolyarov, Vasily S.
    Krasnov, Vladimir M.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Moscow Institute of Physics and Technology, Russia.
    Reconfigurable Josephson Phase Shifter2021Inngår i: Nano Letters, ISSN 1530-6984, E-ISSN 1530-6992, Vol. 21, nr 12, s. 5240-5246Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Phase shifter is one of the key elements of quantum electronics. In order to facilitate operation and avoid decoherence, it has to be reconfigurable, persistent, and nondissipative. In this work, we demonstrate prototypes of such devices in which a Josephson phase shift is generated by coreless superconducting vortices. The smallness of the vortex allows a broad-range tunability by nanoscale manipulation of vortices in a micron-size array of vortex traps. We show that a phase shift in a device containing just a few vortex traps can be reconfigured between a large number of quantized states in a broad [−3π, +3π] range.

  • 2. Grebenchuk, Sergey Yu
    et al.
    Hovhannisyan, Razmik A.
    Dremov, Viacheslav V.
    Shishkin, Andrey G.
    Chichkov, Vladimir I.
    Golubov, Alexander A.
    Roditchev, Dimitri
    Krasnov, Vladimir M.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Stolyarov, Vasily S.
    Observation of interacting Josephson vortex chains by magnetic force microscopy2020Inngår i: Physical Review Research, E-ISSN 2643-1564, Vol. 2, nr 2, artikkel-id 023105Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The ability to control Josephson vortices is instrumental for development of superconducting cryoelectronics. However, direct visualization of multivortex states in Josephson junctions is a challenging task. Here, we employ a magnetic force microscopy (MFM) for the analysis of planar Josephson junctions. We observe a specific MFM response, seen as a chain of small rings. By changing the applied field, we show that the number of rings is equal to the number of flux quanta in the junction. Therefore, each ring represents an individual vortex in a one-dimensional vortex chain within the junction. Our observation demonstrates that the MFM technique can be used for visualization of Josephson vortices and for probing their spatial configurations and mutual interaction.

  • 3.
    Hovhannisyan, Razmik A.
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Moscow Institute of Physics and Technology, Russia.
    Grebenchuk, Sergey Yu
    Baranov, Denis S.
    Roditchev, Dimitri
    Stolyarov, Vasily S.
    Lateral Josephson Junctions as Sensors for Magnetic Microscopy at Nanoscale2021Inngår i: The Journal of Physical Chemistry Letters, E-ISSN 1948-7185, Vol. 12, nr 51, s. 12196-12201Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Lateral Josephson junctions (LJJ) made of two superconducting Nb electrodes coupled by Cu-film are applied to quantify the stray magnetic field of Co-coated cantilevers used in magnetic force microscopy (MFM). The interaction of the magnetic cantilever with LJJ is reflected in the electronic response of LJJ as well as in the phase shift of cantilever oscillations, simultaneously measured. The phenomenon is theorized and used to establish the spatial map of the stray field. Based on our findings, we suggest integrating LJJs directly on the tips of cantilevers and using them as nanosensors of local magnetic fields in scanning probe microscopes. Such probes are less invasive than conventional magnetic MFM cantilevers and simpler to realize than SQUID-on-tip sensors.

  • 4. Karelina, L. N.
    et al.
    Hovhannisyan, Razmik A.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Moscow Institute of Physics and Technology, Russia.
    Golovchanskiy, I. A.
    Chichkov, V.
    Ben Hamida, A.
    Stolyarov, V. S.
    Uspenskaya, L. S.
    Erkenov, Sh A.
    Bolginov, V. V.
    Ryazanov, V. V.
    Scalable memory elements based on rectangular SIsFS junctions2021Inngår i: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 130, nr 17, artikkel-id 173901Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We explore the concept of the Josephson magnetic memory element based on a multilayer two-barrier SIsFS Josephson junction storing the digital state by means of the orientation of magnetization in the F-layer. A diluted PdFe alloy with 1% magnetic atoms is used as a ferromagnet (F), and a tunnel A1Ox layer (I) ensures a high voltage in the resistive state. We have studied two junctions of a rectangular shape in which two digital states are defined by the orientation of the residual F-layer magnetization set along or across the junction in the plane of the ferromagnetic barrier. Implementations of both binary and ternary logic elements are demonstrated. A scalability of rectangular memory elements is analyzed using micro-magnetic modeling.

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