Change of the topology of a superconducting thin film electromagnetically coupled with an array of ferromagnetic nanowires

Trezza, M.; Cirillo, C.; Dolgiy, A. L.; Redko, Sergey; Bondarenko, V. P.; Andreyenka, A. V.; Danilyuk, A. L.; Prischepa, S. L.; Attanasio, C.

doi:10.1088/0953-2048/29/1/015011

Cited by 9 publications

(7 citation statements)

References 70 publications

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“…A broad analysis of the vortex dynamics in FM/SC hybrids is presented in a number of comprehensive reviews [66][67][68] describing the basic effects and the underlying physics. References to the latest works on the subject can be found in [69][70][71][72][73].…”

Section: Introductionmentioning

confidence: 99%

Magnetic gates and guides for superconducting vortices

et al. 2017

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We image the motion of superconducting vortices in niobium film covered with a regular array of thin permalloy stripes. By altering the magnetization orientation in the stripes using a small in-plane magnetic field, we can tune the strength of interactions between vortices and the stripe edges, enabling acceleration or retardation of the superconducting vortices in the sample and consequently introducing strong tunable anisotropy into the vortex dynamics. We discuss our observations in terms of the attraction/repulsion between point magnetic charges carried by vortices and lines of magnetic charges at the stripe edges, and derive analytical formulas for the vortex-magnetic stripes coupling. Our approach demonstrates the analogy between the vortex motion regulated by the magnetic stripe array and electric carrier flow in gated semiconducting devices. Scaling down the geometrical features of the proposed design may enable controlled manipulation of single vortices, paving the way for Abrikosov vortex microcircuits and memories.

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Section: Introductionmentioning

confidence: 99%

Magnetic gates and guides for superconducting vortices

et al. 2017

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“…Then the SiO 2 barrier was realized by RF sputtering (MRC 8602), breaking the vacuum. Afterwards, the final PdNi layer was deposited by dc sputtering [49,50]. A sketch of the resulting substrate/Nb/SiO 2 /PdNi trilayer is shown in the inset of Figure 1.…”

Section: Methodsmentioning

confidence: 99%

Superconducting Order Parameter Nucleation and Critical Currents in the Presence of Weak Stray Fields in Superconductor/Insulator/Ferromagnet Hybrids

et al. 2021

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The stray fields produced by ferromagnetic layers in Superconductor/Insulator/Ferromagnet (S/I/F) heterostructures may strongly influence their superconducting properties. Suitable magnetic configurations can be exploited to manipulate the main parameters of the hybrids. Here, the nucleation of the superconducting phase in an external magnetic field that periodically oscillates along the film width is studied on the base of the numerical solution of the linearized system of Usadel equations. In addition, the effect of the magnetic configuration of the F-layer on the temperature dependence of the critical current density, Jc(T), is investigated in the framework of the Ginzburg–Landau phenomenological theory on the base of the oscillating model of a stray field. By following this approach, the Jc(T) dependence of a Nb/SiO2/PdNi trilayer is reproduced for different magnetic configurations of the PdNi layer.

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“…The method of deposition of organic molecules and nanoparticles was the same as in [224]. According to the authors' expectations, the stray field of magnetic nanoparticles should enhance pinning [233,234] and modify the phase transition to the superconducting state [235,236]. The pinning enhancement has already been manifested in the growth of the critical current even for normal Au nanoparticles chemically linked to the superconducting film [227].…”

Section: Organic Moleculesmentioning

confidence: 99%

Phonon softening in nanostructured phonon–mediated superconductors (review)

Prischepa

Kushnir

2023

J. Phys.: Condens. Matter

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Various aspects of phonon spectrum changes in nanostructured phonon-mediated superconductors are considered. It is shown how, with the development of experimental techniques and, accordingly, obtaining new results, the understanding of the influence of the surface and nanoscale on the magnitude of the electron-phonon interaction and the critical temperature Tc changed and deepened. The review is organized as follows. After the Introduction, in the first part we give the quick theoretical background for the description of superconductivity within the framework of various formalisms. In the second part we describe the properties of granular thin films paying attention to the impact of grain sizes and methods of deposition on the Tc value. The role of material parameters is underlined and different aspects of the behavior of granular thin films are discussed. In the third section the impact of external sources of modification of the phonon spectra like noble gases and organic molecules are considered. Problems and progress in this area are discussed. The fourth part is dedicated to the phonon modification and related quantum size effects in nanostructured superconductors. In the fifth part we review the results of direct evidence of phonon softening in nanostructured superconductors and in the sixth section we discuss a possible alternative description of the superconducting properties of nanostructured superconductors related to the concept of metamaterials. In the seventh and eighth parts we review the impact of substrates with lattice mismatched parameters and graphene sheets, respectively, on the modification of the phonon spectrum and enhancement of superconductivity in various superconducting thin films. Finally, in the last ninth section we consider the nonequilibrium superconductivity driven by femtosecond pulses of light, which leads to generation of coherent phonons and to a significant increase in the critical temperature in a number of superconducting materials.

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Change of the topology of a superconducting thin film electromagnetically coupled with an array of ferromagnetic nanowires

Cited by 9 publications

References 70 publications

Magnetic gates and guides for superconducting vortices

Magnetic gates and guides for superconducting vortices

Superconducting Order Parameter Nucleation and Critical Currents in the Presence of Weak Stray Fields in Superconductor/Insulator/Ferromagnet Hybrids

Phonon softening in nanostructured phonon–mediated superconductors (review)

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