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Результат пошуку
Ткаченко Віра Сергіївна |
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 | Науковий ступінь: Кандидат фізико-математичних наук Звання: Доцент Сфера діяльності: наукові інтереси пов’язані з дослідженням магнітних властивостей наноструктур |
| Факультет: | Факультет хімії, біології і біотехнологій |
| Підрозділ: | Кафедра біофізичної хімії, фізики і педагогіки |
| ORCID: | https://orcid.org/0000-0001-6064-5474 |
| Google scholar: | https://scholar.google.com/citations?user=dmYMB3MAAAAJ&hl=ru |
| Scopus: | https://www.scopus.com/authid/detail.uri?authorId=13608549400 |
| Web of Science: | |
| Корп.ел.пошта: | v.tkachenko@donnu.edu.ua |
| Профайл: | http://rang.donnu.edu.ua/?pg=kt&nu=77#search |
Праці
Знайдено документів: 15| №п.п. | Автор | Назва публікації | Спів.автори | Видавництво | Назва журналу | Мова | Рік | Тип | Запитів на цитування | Файл |
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| 1 | Ткаченко Віра Сергіївна | Влияние структуры межслойных границ на спектр спиновых волн в магнонном кристалле | Ткаченко, В.С. Кучко, А.Н. | немає | Металлофизика и новейшие технологии | російська | 2005 | стаття | 0 |  |
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Проведено рассмотрение спектра обменных спиновых волн в мультислойном магнитном материале с периодически модулированной величиной константы одноосной анизотропии (магнонном кристалле) с конечной толщиной межслойных границ. Предложена модель с линейным распределением величины анизотропии в переходном слое. Найдена зависимость ширины запрещенных зон в спектре от отношения толщины переходного слоя к периоду мультислойного материала. Проведено обсуждение влияния характера распределения параметров материала в переходном слое на спектр спиновых волн
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| 2 | Ткаченко Віра Сергіївна | Mathematical Model of Volume Optical Interconnection Reconfiguration Utilizing Acousto- Optic Beam Forming | Tkachenko, V.S. Lipinskii, A.Y. | немає | Proceedings of the 2017 IEEE First Ukraine Conference on Electrical and Computer Engineering (UKRCON) | англійська | 2017 | стаття | 0 | |
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The mathematical model of volume optical interconnection reconfiguration by acousto-optical beam forming approach is proposed in the paper. The restrictions of proposed model were considered as well as results of simulations of interconnections’ patterns were presented
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| 3 | Ткаченко Віра Сергіївна | Mathematical Model of Volume Optical Interconnection in LiNbO3 Crystal | Tkachenko, V.S. Lipinskii, A.Y. | немає | Proceedings of the 2016 International Conference on Mathematical Methods in Electromagnetic Theory | англійська | 2016 | стаття | 0 | |
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The mathematical model of volume optical interconnection elements that are formed within the LiNbO3 crystal is proposed in the paper. The simulations using this model were conducted. The possibility to reconfigure the structure of optical interconnections was demonstrated
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| 4 | Ткаченко Віра Сергіївна | Implementation and testing of hash function based on modified skein algorithm | Barybin, Oleksii Tkachenko, Vira Zhabska, Yelyzaveta Petrova, Iryna | немає | Проблеми інформаційних технологій | англійська | 2018 | стаття | 0 | |
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The article shows that the original Skein hash algorithm, which was developed as part of the competition for the new standard SHA-3 of the National Institute of Standards and Technology USA (NIST) and was one of five finalists can be modified to improve its operation efficiency in systems with multicore processors, which are used in almost all modern desktop and mobile devices. Analysis of the few publications that dedicated to such improvement of the original algorithm shows that all the authors focus on improving efficiency by optimizing the algorithm computations parallelization because computing speed was one of its main weaknesses. The simplification the original algorithm was not considered before and became the main purpose of the article.
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| 5 | Ткаченко Віра Сергіївна | Spin wave spectrum of a magnonic crystal with an isolated defect | V.V. Kruglyak, M.L.Sokolovskii, V.S.Tkachenko, A.N. Kuchko | немає | Journal of Applied Physics | англійська | 2005 | стаття | 0 | |
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Real magnonic crystals - periodic magnetic media for spin wave (magnon) propagation - may contain some defects. We report theoretical spin wave spectra of a one dimensional magnonic crystal with an isolated defect. The latter is modeled by insertion of an additional layer with thickness and magnetic anisotropy values different from those of the magnonic crystal constituent layers. The defect layer leads to appearance of several localized defect modes within the magnonic band gaps. The frequency and the number of the defect modes may be controlled by varying parameters of the constituent layers of the magnonic crystal
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| 6 | Ткаченко Віра Сергіївна | Spin waves in a magnonic crystal with sine-like interfaces | V.S. Tkachenko, V.V. Kruglyak, A.N. Kuchko | немає | Journal of Magnetism and Magnetic Materials | англійська | 2006 | стаття | 0 | |
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The spectrum of exchange spin waves in a magnonic crystal (periodic magnetic multilayer) with diffuse interfaces is derived for a model with a cosine-like profile of the uniaxial anisotropy value at the interfaces. The dependence of the band gap size upon the interface thickness and the depth of modulation of the anisotropy value is analyzed. In particular, it is shown that diffuse interfaces may lead to a magnonic spectrum in which band gaps have size equal to or even larger than those in the model with sharp (infinitely thin) interfaces (Kronnig–Penney model).
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| 7 | Ткаченко Віра Сергіївна | Spin wave reflection from semi-infinite magnonic crystals with diffuse interfaces | V.S. Tkachenko, V.V. Kruglyak, A.N. Kuchko | немає | Metamaterials | англійська | 2009 | стаття | 0 | |
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The frequency dependence of the coefficient of spin wave reflection from a semi-infinite magnonic crystal with a periodically modulated value of the uniaxial anisotropy and a finite thickness of interfaces has been investigated, assuming a linear distribution of the anisotropy value in the interfaces. The analysis shows that the performance of magnonic devices employing magnonic crystals as a filtering element can degrade as the thickness of interfaces increases, e.g. due to the process of diffusion between constituent layers of the magnonic crystals
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| 8 | Ткаченко Віра Сергіївна | Spectrum and reflection of spin waves in magnonic crystals with different interface profiles | V.S. Tkachenko, V.V. Kruglyak, A.N. Kuchko | немає | Physical review. B, Condensed matter | англійська | 2010 | стаття | 0 | |
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Using the transfer-matrix method, we have developed a theory of exchange spin waves in a thin cylindrical magnonic crystal (periodically layered all-ferromagnetic nanowire) with diffuse interfaces. The magnonic spectrum and the frequency dependence of the reflection coefficient of spin waves from a junction between a homogeneous magnetic nanowire and a magnonic crystal have been calculated and compared. Diffuse interfaces with linear and sinusoidal profiles of variation in the uniaxial anisotropy value have been considered, also allowing for asymmetry in the relative thicknesses of either main layers, or interfaces, or both. We have found that, although the thickness and profile of interfaces have a significant effect on the size and position of the magnonic band gaps, the smoothing of interfaces does not lead to disappearance of the band gaps. At the same time, the profiles and relative thicknesses of interfaces might provide additional means by which to design magnonic crystals with
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| 9 | Ткаченко Віра Сергіївна | Propagation and scattering of spin waves in curved magnonic waveguides | V.S. Tkachenko, A.N. Kuchko, M.Dvornik, V.V. Kruglyak | немає | Applied Physics Letters | англійська | 2012 | стаття | 0 | |
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We report a continuous medium theory of dispersion and scattering of spin waves propagating in thin nanowire magnonic waveguides with curved regions. Assuming that the static magnetization is aligned along the waveguide, the curvature leads to a “geometrical” effective magnetic field term that is proportional to the square of the ratio of the exchange length to the radius of curvature of the waveguide. The term is small enough to favor the use of bended nanowire waveguides in planar magnonic data architectures. However, a stronger (multiple) winding (e.g., within helical structures) could enable design of magnonic waveguides with desired properties
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| 10 | Ткаченко Віра Сергіївна | An effect of the curvature induced anisotropy on the spectrum of spin waves in a curved magnetic nanowire | V.S. Tkachenko, A.N. Kuchko, V.V. Kruglyak | немає | Low Temperature Physics | англійська | 2013 | стаття | 0 | |
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Within the framework of the solid state theory, an expression for the spectrum of spin waves propagating in a thin magnetic nanowire curled into a helix (spiral) is obtained. Its modification under the effect of a periodic modulation of the helical pitch is analyzed. In particular, it is shown that the periodic modulation of the helix pitch leads to the appearance of band gaps in the spectrum of spin waves. The influence of the modulation depth of the helical pitch on a size of the first gap is considered
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| 11 | Ткаченко Віра Сергіївна | Symmetry-related criteria for the occurrence of defect states in magnonic superlattices | J.W.Kloss, V.S. Tkachenko | немає | Journal of Applied Physics | англійська | 2013 | стаття | 0 | |
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We investigate analytically the occurrence of magnonic defect states in the exchange regime for the system geometry with the defect linking two semi-infinite superlattices at the same symmetry points. The frequency ranges forbidden and allowed to defect states are determined in the low-frequency region. Non-overlapping frequency ranges allowed to either even or odd defect states are found to occur within each forbidden gap in higher frequencies. Our semi-analytical calculations of the dispersion relation based on the solutions obtained in the matching procedure are supported by the computed transmission spectra
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| 12 | Ткаченко Віра Сергіївна | Formation of the band spectrum of spin waves in 1D magnonic crystals with different types of interfacial boundary conditions | V.V.Kruglyak, C.S. Davies, O.Yu Gorobets, Yu.I. Gorobets, A.N. Kuchko | немає | Journal of Physics D Applied Physics | англійська | 2017 | стаття | 0 | |
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We report a theoretical study of the spin-wave band spectrum of magnonic crystals formed by stacking thin-film magnetic layers, with general assumptions about the properties of the interfaces between the layers. The use of the Barnaś-Mills magnetization boundary conditions has enabled us to systematically trace the origin of the magnonic band gaps in the spin-wave spectrum of such systems. We find that the band gaps are a ubiquitous attribute of a weakened interlayer coupling and a finite interface anisotropy (pinning). The band gaps in such systems represent a legacy of the discrete spin-wave spectrum of the individual magnetic layers periodically stacked to form the magnonic crystal rather than resulting from Bragg scattering.
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| 13 | Ткаченко Віра Сергіївна | Magnonic band spectrum of spin waves in an elliptical helix | A.V. Golovchan, V.V. Kruglyak, V.S. Tkachenko, A.N. Kuchko | немає | Royal Society Open Science | англійська | 2018 | стаття | 0 | |
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We show that the spin-wave spectrum in an elliptical helix has a band character. The size of the first band gap calculated using the perturbation theory is shown to scale as square root of the eccentricity. Curved magnonic waveguides of the kind considered here could be used as structural elements of future three-dimensional magnonic architectures
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| 14 | Ткаченко Віра Сергіївна | Spin wave modes in a cylindrical nanowire in crossover dipolar-exchange regime | J. Rychly, V.S. Tkachenko, J.W. Kloss, A.N. Kuchko, M. Krawczuk | немає | Journal of Physics D Applied Physics | англійська | 2018 | стаття | 0 | |
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Nanoscale magnetic systems have been studied extensively in various geometries, such as wires of different cross-sections, arrays of wires, dots, rings, etc. Such systems have interesting physical properties and promising applications in advanced magnetic devices. Uniform magnetic nanowires are the basic structures which were broadly investigated. However, some of their dynamical properties, like: (anti)crossing between the spin wave modes and impact of the magnetic field on the spin wave spectrum, still need to be exploited. We continue this research by investigation of the spin wave dynamics in solid Ni nanowire of the circular cross-section
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| 15 | Ткаченко Віра Сергіївна | Spin Wave Modes in a Cylindrical Nanowire in Crossover of Dipolar-Exchange Regime | J. Rychly, V.S. Tkachenko, J.W. Kloss, A.N. Kuchko, M. Krawczuk | немає | Conference: The 37th International Symposium on Dynamical Properties of Solids-DyProSo | англійська | 2019 | тези | 0 | |
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Although the magnetic wires have been broadly investigated, some of their dynamical properties, like: (anti)crossing between the spin wave modes and the impact of the magnetic field on the spin wave spectrum, still need to be explored
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