Registration Number
0225U004166,
(0124U003757)
, R & D reports
Title
Manyfold-degenerated metastable states of spontaneous polarization in nanoferroics: theory, experiment and perspectives for digital nanoelectronics.
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Нанорозмірні та наноструктуровані феро-йоніки з негативною ємністю: теорія, експеримент та застосування.
Head
Morozovska Hanna M., д.ф.-м.н.
Registration Date
21-11-2025
Organization
Institute of Physics of National Academy of Sciences of Ukraine
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The goal of the project is to create multiply degenerate metastable states of spontaneous electrical polarization induced by dimensional effects in nanoferroics; establishing the main regularities of the spatio-temporal evolution of these states in thin films, nanoparticles and nanocomposites of ferroelectrics, ferro-ionics and multiferroics; development of recommendations for the use of multiply degenerate metastable states in digital nanoelectronics.
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The conditions for the emergence of metastable states of the domain structure of the ferro-ionic layer, which are characterized by negative capacitance, were analyzed using the example of ferroelectric nanoparticles Sn2P2S6 and BaTiO3, CuInP2S6 ferrielectric nanoflakes, and HfxZr1-xO2 ferroelectric-antiferroelectrics. The conditions for the emergence of metastable labyrinth domains in ensembles of Sn2P2S6, CuInP2S6, and HfxZr1-xO2 ferroelectric nanoparticles were found and a theoretical analysis of the influence of size and surface effects on their polar, dielectric, electrophysical properties, and states with negative capacitance was performed. Multilayer nanostructures containing nanosized ferro-ionics of wurtzites Al1-xScxN-AlN, Mg1-xZnxO-ZnO, Mg1-xZnxO-MgO and nanocomposite films of fluorites HfxZr1-xO2 were synthesized and studied. The influence of size and surface effects on their polar, dielectric and electrophysical properties was analyzed. The nucleation of nanodomains induced by the PFM probe, the features of local polarization hysteresis loops and coercive fields in two-layer and three-layer wurtzite nanostructures were analyzed. Resistive switching was revealed in HfxZr1-xO2 nanocomposites. The IR and Raman scattering of nanostructures containing ferro-ionics, in particular Bi1-xSmxFeO3 nanoparticles, was analyzed. Using X-ray diffraction, transmission electron microscopy, Raman and IR Fourier spectroscopy, it was found that compounds with gradual substitution of Bi3+ by Sm3+ are characterized by a sequence of structural transformations from the rhombohedral phase R3c to the orthorhombic phase Pbnm. The microstructure of the synthesized nanostructures was analyzed and correlations with their current-voltage and charge-voltage characteristics were found. Recommendations for promising applications of nano-ferro-ionics with negative capacitance were developed.
Product Description
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Morozovska Hanna M.
Leonenko Yevhen V.
Yaremkevych Andrii D.
Fesenko Olena Maryanivna
Hudenko Yuliia M.
Pylypchuk Oleksandr S.
Ralliev Maksym V.
Denis O. Stetsenko
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2025-11-21
