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Information × Registration Number 0220U000514, 0116U003192 , R & D reports Title Pecularities of mechanical, electrical and magnetic processes in low-dimensional systems at nanoscales popup.stage_title Head Volkov Sergey N., Доктор фізико-математичних наук Registration Date 24-02-2020 Organization Bogolybov Institute for Theoretical Physics of NASU popup.description2 Nonlinear physical systems with complex topologies are very common in nature. Examples are biological macromolecules, polynucleotides, nanotubes, nanoparticles, nanoproducts, membranes. Recent advances in microstructuring technology have made it possible to manufacture artificial low-dimensional systems with complex topologies. One important question that arises in this area of research is how topology and nonlinearity effects can complement, interfere with, or stabilize one another at the nanoscale. Solving this issue is fundamental, but in recent years it has also been important for experimental applications. in nanophysics, in particular in the study of domain walls and skyrmions arising in magnetic systems and playing an important role in the study of their static and dynamic properties, as well as nonlinear excitations en informational macromolecules of DNA that have pronounced polymorphic properties. The study of localized excitations in low-dimensional systems with complex topologies shows that the dynamics of magnetic domain walls and skyrmions can be effectively controlled, which enables the construction of next-generation storage devices that have high capacitance and speed and are energy independent. At the same time, it became clear that very similar effects are observed for polymorphic biological macromolecules, whereby precision regulation of DNA genetic activity, preservation of macromolecule structure under relatively large external deformations in the biological cell during the information transfer processes becomes possible. Thus, within the framework of the project, a two-stage mechanism of threshold deformation in a DNA macromolecule under the action of an external force is proposed. In the first stage domains with a bistable conformation of monomers in the macromolecule chain are formed at a critical external force value. The second is the cooperative process of domain wall propagation - the boundaries between the natural (B-form) and deformed conformations. The role of threshold stretching and double helix opening by external force in DNA mechanics is determined. Thus, the appearance of bistability causes a threshold effect of deformation. The result obtained is essentially similar to the findings of studies of the relationship between the deformation of ferromagnetic materials and the external magnetic field. The project, with the help of numerical experiments, demonstrated the ability to effectively control the parameters of a flexible ferromagnetic tape with the help of an external magnetic field. During the reporting period, a number of multicomponent nonlinear integrable systems were elaborated and studied, suitable for modeling the excited states of regular low-dimensional objects of both natural and synthetic origin, and formulated the conditions for controlling the dynamics of such states. Product Description popup.authors Єршов К.В. Вахненко О.О. Гайдідей Ю.Б. Здоревський О.О. Каневська П.П. Кравчук В.П. Крячко Є.С. Малишева Л.І. П'ятницький Д.В. Перепелиця С.М. popup.nrat_date 2020-07-03 Close