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Your search keyword '"L. N. Karelina"' showing total 3 results
Start Over Author "L. N. Karelina" Topic 010306 general physics
3 results on '"L. N. Karelina"'

1. Magnetoresistance of a Ferromagnet/Superconductor/Ferromagnet Trilayer Microbridge Based on Diluted PdFe Alloy

Author

A. Ben Hamida, Vitaly V. Bolginov, Sh. A. Erkenov, L. N. Karelina, V. I. Chichkov, S. V. Egorov, Valery V. Ryazanov, and Igor A. Golovchanskiy

Subjects
Superconductivity, Materials science, Physics and Astronomy (miscellaneous), Solid-state physics, Condensed matter physics, Magnetoresistance, Alloy, Normal state, engineering.material, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, 01 natural sciences, 010305 fluids & plasmas, Magnetic field, Condensed Matter::Materials Science, Ferromagnetism, 0103 physical sciences, engineering, Condensed Matter::Strongly Correlated Electrons, 010306 general physics
Abstract

A negative magnetoresistive effect has been observed for ferromagnet/superconductor/ferromagnet (FSF) microbridges based on diluted ferromagnetic PdFe alloy containing as small as 1% of magnetic atoms. The effect is represented by sharp negative peaks in magnetoresistance at magnetic fields opposite in sign to the initial saturated magnetizations. Microstructuring of the FSF trilayers does not suppress the effect: the most pronounced dips were obtained for the smallest bridges 6–8 µm wide and 10–15 µm long. The negative magnetoresistance peak was observed at temperatures within the superconducting transition and reaches a noticeable value of up to 1.3% of the normal state resistance.

Published
2020
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2. Properties of Ferromagnetic Josephson Junctions for Memory Applications

Author

Aymen Ben Hamida, Valery V. Ryazanov, Francesco Tafuri, Vitaly V. Bolginov, Oleg A. Mukhanov, Roberta Caruso, Giovanni Piero Pepe, Gabriele Campagnano, Igor V. Vernik, Davide Massarotti, Alessandro Miano, L. N. Karelina, Caruso, Roberta, Massarotti, Davide, Miano, Alessandro, Bolginov, Vitaliy V., Hamida, Aymen Ben, Karelina, Liubov N., Campagnano, Gabriele, Vernik, Igor V., Tafuri, Francesco, Ryazanov, Valery V., Mukhanov, Oleg A., and Pepe, Giovanni P.

Subjects
Josephson effect, Superconductivity, Materials science, business.industry, Condensed Matter - Superconductivity, FOS: Physical sciences, 02 engineering and technology, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Electronic, Optical and Magnetic Materials, Magnetic field, Characterization (materials science), Superconductivity (cond-mat.supr-con), Ferromagnetism, Pulse-amplitude modulation, Condensed Matter::Superconductivity, 0103 physical sciences, Optoelectronics, Electrical and Electronic Engineering, 010306 general physics, 0210 nano-technology, business, Microwave
Abstract

In this work we give a characterization of the RF effect of memory switching on Nb-Al/AlOx-(Nb)-Pd$_{0.99}$Fe$_{0.01}$-Nb Josephson junctions as a function of magnetic field pulse amplitude and duration, alongside with an electrodynamical characterization of such junctions, in comparison with standard Nb-Al/AlOx-Nb tunnel junctions. The use of microwaves to tune the switching parameters of magnetic Josephson junctions is a step in the development of novel addressing schemes aimed at improving the performances of superconducting memories., Comment: IEEE Trans. Appl. Supercond. Special Issue ISEC2017

Published
2018
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3. RF assisted switching in magnetic Josephson junctions

Author

Francesco Tafuri, O.A. Mukhanov, L. N. Karelina, Giovanni Piero Pepe, Igor V. Vernik, Davide Massarotti, Valery V. Ryazanov, Vitaly V. Bolginov, Alessandro Miano, Roberta Caruso, A. Ben Hamida, Caruso, R., Massarotti, D., Bolginov, V. V., Ben Hamida, A., Karelina, L. N., Miano, A., Vernik, I. V., Tafuri, F., Ryazanov, V. V., Mukhanov, O. A., and Pepe, G. P.

Subjects
Josephson effect, Physics, business.industry, Condensed Matter - Superconductivity, Magnetic storage, General Physics and Astronomy, FOS: Physical sciences, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, law.invention, Magnetic field, Superconductivity (cond-mat.supr-con), Physics and Astronomy (all), law, Magnetic flux quantum, 0103 physical sciences, Scalability, Optoelectronics, Current (fluid), 010306 general physics, 0210 nano-technology, business, Realization (systems), Microwave
Abstract

We test the effect of an external RF field on the switching processes of magnetic Josephson junctions (MJJs) suitable for the realization of fast, scalable cryogenic memories compatible with Single Flux Quantum logic. We show that the combined application of microwaves and magnetic field pulses can improve the performances of the device, increasing the separation between the critical current levels corresponding to logical '0' and '1'. The enhancement of the current level separation can be as high as 80% using an optimal set of parameters. We demonstrate that external RF fields can be used as an additional tool to manipulate the memory states, and we expect that this approach may lead to the development of new methods of selecting MJJs and manipulating their states in memory arrays for various applications., Comment: 7 pages, 3 figures

Published
2018

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