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Information × Registration Number 0220U100918, 0119U100315 , R & D reports Title Dynamic phenomena and phase transitions in micro and nanostructured materials for modern magnetoelectronics devices. popup.stage_title Head Sheka Denys D., Доктор фізико-математичних наук Registration Date 29-01-2020 Organization Taras Shevchenko National University of Kyiv popup.description2  Object of study - Solid metal alloys characterized by magnetostructural phase transitions, magnetic structures of complex geometry, layered magnetic structures of reduced dimension with dielectric and metallic layers, ordered and disordered arrays of magnetic nanoelements. The aim of the study is to study the dynamic electromagnetic phenomena and phase transitions in micro- and nanostructured magnetic materials, magnetic layered structures and structures with complex geometry for the improvement of existing and development of new devices of spintronics, magnonics, spin-orbitronics, and scrytrionics. Research methods - theoretical analysis, numerical modeling, experimental studies in microwave and optical range, radio, photoelectron and Auger electron spectroscopy, atomic force and electron microscopy. The existence of bound local states in the spectrum of self-excited excitations of antiferromagnetic skyrmion is proposed and experimental ways of their observation are proposed. A curvature-induced magnon crystal is proposed in which periodic deformation of a nanowire results in the appearance of a band spectrum of magnons. The possibility of using the discussed structure as a magnon filter is shown. Based on the first principles calculations, a model of a solid body with two equivalent magnetic sublattices is constructed, which is the simplest magnetic system with a combination of ferro- and antiferromagnetic interactions. It is shown that this model satisfactorily describes the experimental data obtained for Ni-Mn-Sn alloys. A theory of the magnetocaloric effect is proposed, in which the Gibbs potential of shape memory alloys is explicitly expressed through spin exchange parameters, and the magnetocaloric effect is estimated as a temperature derivative of this potential. Product Description popup.authors Budnyk Mykola М. Vasylev Anatoliy G. Danko Volodymyr P. Danko Oleksandr V. Derevnina Zinaida M. Zavyslyak Іgor V. Koblyanskyj Yuriy V. Kovalenko Andriy V. Kovalenko Valeriy F. Kolesnyk Oleg G. Kondratovych Yuriy M. Kot Oleksandr O. Kotov Mykhailo M. Kulyk Sergiy P. Kuraschov Vitaliy N. Len Yurii A. Lvov Viktor A. Malyschev Volodymyr Yu. Melkov Gennadiy А. Muzyka Bogdan O. Pylypovskyi Oleksandr V. Popov Maksym O. Prokopenko Oleksandr V. Reznikov Mikhail I. Rodionova Tetyana V. Romanyuk Olena V. Sizhuk Andrii S. Chernoluzkyj Dmytro L. Sheka Denys D. Yakymov Costyantyn I. popup.nrat_date 2020-04-02 Close