Персона: Мороз, Анна Николаевна
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Институт лазерных и плазменных технологий
Стратегическая цель Института ЛаПлаз – стать ведущей научной школой и ядром развития инноваций по лазерным, плазменным, радиационным и ускорительным технологиям, с уникальными образовательными программами, востребованными на российском и мировом рынке образовательных услуг.
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Мороз
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Анна Николаевна
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- ПубликацияТолько метаданныеSimulations of local field inhomogeneities of magnetic tracks and their impact on the magnetization of HTSs with defects(2021) Moroz, A. N.; Rudnev, I. A.; Kashurnikov, V. A.; Мороз, Анна Николаевна; Руднев, Игорь Анатольевич; Кашурников, Владимир Анатольевич© 2021 Institute of Physics Publishing. All rights reserved.Using the Monte Carlo method, the full and partial magnetization loops of a YBCO superconductor have been studied. The partial loops simulated field inhomogeneities occurring on magnetic tracks in levitation systems. The influence of temperature and defect concentration on the shape and area of the full and partial hysteretic curves has been studied. The highest considered defect concentration provided the least partial curve area which meant less hysteresis energy losses and greater levitation stability.
- ПубликацияТолько метаданныеVortex Structure of HTSC in an Inhomogeneous Magnetic Field(2021) Maksimova, A. N.; Kashurnikov, V. A.; Moroz, A. N.; Rudnev, I. A.; Максимова, Анастасия Николаевна; Кашурников, Владимир Анатольевич; Мороз, Анна Николаевна; Руднев, Игорь АнатольевичThe penetration of a magnetic flux into an anisotropic superconductor placed in a gradient magnetic field equivalent to a permanent magnet field is studied numerically. Vortex configurations formed in a defect-free superconductor and also in a superconductor contained defects are calculated. It is shown that the penetration of an inhomogeneous magnetic field into a layered superconductor occurs via the formation of incomplete vortex lines at the boundary, which implies to the appearance of a magnetic field component parallel to the layers. The dependences of the magnetization and energy in magnetic field are calculated for a tree-dimensional HTSC sample and it is shown that there are minima at the energy plot corresponding to stable positions of a magnet with respect to the superconductor.
- ПубликацияТолько метаданныеCritical current of a layered high-temperature superconductor with tilted irradiation defects(2024) Maksimova, A. N.; Moroz, A. N.; Rudnev, I. A.; Pokrovskii, S. V.; Kashurnikov, V.; Максимова, Анастасия Николаевна; Мороз, Анна Николаевна; Руднев, Игорь Анатольевич; Покровский, Сергей Владимирович; Кашурников, Владимир Анатольевич
- ПубликацияТолько метаданныеDynamic Vortex States in High-Temperature Superconductors under Pulsed Magnetization(2020) Moroz, A. N.; Maksimova, A. N.; Kashurnikov, V. A.; Rudnev, I. A.; Мороз, Анна Николаевна; Максимова, Анастасия Николаевна; Кашурников, Владимир Анатольевич; Руднев, Игорь Анатольевич© 2020, Pleiades Publishing, Ltd.Abstract: A vortex system of the Bi-2212 superconductor in an external magnetic field linearly increasing at different rates has been numerically simulated using the Monte Carlo method. The effect of the concentration and distribution of pinning centers on the penetration of the magnetic flux has been studied. Features of the flux penetration have been observed and described in terms of the vortex system dynamics and the conditions for their occurrence have been determined. The increasing dependences of the saturation field on the defect concentration in homogeneous and inhomogeneous samples have been obtained.
- ПубликацияТолько метаданныеVortex System Dynamics upon Pulsed Magnetization of a HTS(2019) Moroz, A. N.; Maksimova, A. N.; Kashurnikov, V. A.; Rudnev, I. A.; Мороз, Анна Николаевна; Максимова, Анастасия Николаевна; Кашурников, Владимир Анатольевич; Руднев, Игорь Анатольевич© 2019, Pleiades Publishing, Ltd.A numerical investigation of the response of a HTS with different numbers of defects to the action of rectangular magnetic field pulses with a varying amplitude is carried out. The time dependences of a magnetic field trapped by the superconductor are calculated at different pulse parameters. The values of the HTS response to pulsed and gradual magnetization and demagnetization of the sample are compared, which reveals that magnetic flux trapping is more efficient under the action of pulses. A feature in the behavior of the vortex lattice acted on by field pulses is established, which relates to correlation between the number of defects and pulse amplitude. Flux trapping is shown to have a maximum dependent on the concentration of defects at each pulse amplitude.
- ПубликацияТолько метаданныеMechanism of the Generation of the Critical Current in High-Temperature Superconductors with Through Microdefects(2021) Maksimova, A. N.; Kashurnikov, V. A.; Moroz, A. N.; Rudnev, I. A.; Максимова, Анастасия Николаевна; Кашурников, Владимир Анатольевич; Мороз, Анна Николаевна; Руднев, Игорь Анатольевич© 2021, Pleiades Publishing, Ltd.Abstract: The critical current of a model high-temperature superconductor (HTSC) with defects in the form of through holes (antidots) with characteristic sizes on the order of the magnetic-field penetration depth (or larger) is calculated. To this end, subprocesses equivalent to the magnetic-flux trapping by a hole and creation of a vortex near the hole edge are introduced into the model of a layered HTSC. It is shown that account for these subprocesses yields a physical mechanism, which makes it possible to describe correctly the nonmonotonic dependence of the critical current on the antidot characteristic size, which is similar to the experimental one. The calculations are carried out for a pure superconductor and a superconductor with nanoscale pinning centers. It is shown that the presence of nanoscale pinning centers along with antidots does not make qualitative changes in the relationship between the antidot radius and magnetic-flux pinning character and the critical-current behavior in an HTSC.
- ПубликацияТолько метаданныеModeling of vortex dynamics in HTSs with defects under the impact of pulsed magnetic field(2021) Moroz, A. N.; Kashurnikov, V. A.; Rudnev, I. A.; Maksimova, A. N.; Мороз, Анна Николаевна; Кашурников, Владимир Анатольевич; Руднев, Игорь Анатольевич; Максимова, Анастасия НиколаевнаBy means of the Monte Carlo method, a numerical study of the vortex system in a high-temperature superconductor under the impact of pulses of magnetic field has been conducted. Various shapes and amplitudes of pulses have been considered. Samples with random and regular distributions of three different numbers of defects have been compared from the viewpoint of efficiency of flux trapping. The low-temperature behavior of vortices and their penetration into samples have been shown to be independent of the pulse shape but strongly dependent of the type of pinning distribution. Saturating dependences of density of trapped magnetic flux on the pulse amplitude have been obtained. The samples with random pinning demonstrated higher efficiency of flux trapping at lower pulse amplitudes, and the samples with a triangular lattice of defects-at higher amplitudes. If the amplitude exceeded the saturation field of both samples, the trapped field was almost equal. The increasing number of defects has lead to an increase in trapped field within the considered range of concentrations.
- ПубликацияТолько метаданныеMagnetic and Transport Properties of Type-II Superconductors: Numerical Modeling and Experiment(2021) Kashurnikov, V. A.; Maksimova, A. N.; Rudnev, I. A.; Moroz, A. N.; Кашурников, Владимир Анатольевич; Максимова, Анастасия Николаевна; Руднев, Игорь Анатольевич; Мороз, Анна НиколаевнаThis review is devoted to various experimental and theoretical studies of the magnetic and transport properties of type-II superconductors. The main interest is in the study of the behavior of the vortex system, its dynamics, and interaction with pinning centers: defects. Two widely used methods of numerical simulation of a vortex system are considered here: Monte Carlo and molecular dynamics. The effects investigated by these methods, such as various phase transitions in the vortex lattice, its melting, and inverse crystallization, are described. The existing models of a layered anisotropic high-temperature superconductor in a magnetic field perpendicular and inclined with respect to the superconducting layers are considered. Methods, actively studied and applied in practice for improving the current-carrying characteristics of a superconductor by introducing various nano- and microscopic artificial defects, including those with ferromagnetic ordering, are described. Various effects observed in composite (including multilayer) ferromagnet-superconductor structures, which are still of interest, are considered.
- ПубликацияТолько метаданныеOptimizing trapped field in superconductors with perforations(2022) Gokhfeld, D. M.; Maksimova, A. N.; Kashurnikov, V. A.; Moroz, A. N.; Максимова, Анастасия Николаевна; Кашурников, Владимир Анатольевич; Мороз, Анна НиколаевнаThe use of artificial holes can improve the performance of high-temperature bulk superconductors. We report the results of Monte Carlo simulations of the trapped magnetic flux in superconducting samples with different configurations of perforated holes. Vortex trapping and emission at the hole boundary were modeled to account for flux pinning on the holes. It was found that the trapped flux can reach its maximum value, which does not depend on the number of holes. The dependence of the trapped flux on the diameter and number of holes is explored and described by the suggested relations that account for pinning on the holes and the effective hole area. Recommendations are provided to attain the maximum trapped flux for a fixed number or diameter of holes. © 2022 Elsevier B.V.
- ПубликацияТолько метаданныеLevitation Forces Acting on an HTS Sample in the Field of a Permanent Magnet(2022) Maksimova, A. N.; Rudnev, I. A.; Kashurnikov, V. A.; Moroz, A. N.; Максимова, Анастасия Николаевна; Руднев, Игорь Анатольевич; Кашурников, Владимир Анатольевич; Мороз, Анна Николаевна
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