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Registration Number

0223U003850, 0123U102727 , R & D reports

Title

The influence of size effects on the electrophysical properties of graphene-ferroelectric nanostructures

Head

Morozovska Hanna М., Доктор фізико-математичних наук

Registration Date

12-07-2023

Organization

Institute of Physics of National Academy of Sciences of Ukraine

Description

The object of research is ferroelectrics, graphene, graphene-ferroelectric nanostructures and complexes. The subject of research is dimensional effects of electrophysical, polar, magnetic and magnetoelectric properties of graphene-ferroelectric nanostructures. The goal is to establish the influence of dimensional effects on the electrophysical, polar, magnetic and magnetoelectric properties of graphene-ferroelectric nanostructures (GFENS) for the creation of the latest non-volatile memory devices and ultra-sensitive sensors. The purpose of the 1st stage is to analyze the influence of dimensional effects on the electrophysical, polar and magnetic properties of GFENS. Main results. The tasks of the 1st stage, which collectively significantly improve the state of development of the problem, have been fully completed, in particular: A) The effect of dimensional effects on the phase states of polarization and the dynamics of the domain structure of the ferroelectric multiferroic Hf1-xZrxO2 covered with a graphene layer was theoretically analyzed. Using the effective Landau free energy, we found a complete correlation between the polarization distribution in the Hf1-xZrxO2 film and the charge carriers in single-layer graphene. B) With the help of Raman spectroscopy and X-ray diffraction, measurements and analysis of the spectral properties of ferrodistortion SrBi2(Ta1-xNbx)2O9 ferroelectrics were carried out, and a non-monotonic shift of the maximum of the Raman band at 810 cm-1 with an increase in the Nb content was revealed, which is caused by ferrodistortion, namely the tilt of the octahedra (Ta,Nb)O6. C) With the help of Raman spectroscopy, X-ray diffraction and measurements of magnetic properties, new knowledge about the structure and phase composition of ferroelectrics-antiferromagnets Bi1-xRExFeO3 (RE - rare earth elements La, Lu or Sm) was obtained.

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Bodnaruk Andriy Vasyl’jvych
Golub Pavlo Volodymyrovych
Morozovs’ka Anna M
Rallev Maxim Vitaliyovuch
Starynets Serhii Mykhaylovych
Tkachenko Vitaly Sergiyovych
Fesenko Olena M.
Yaremkevych Andriy Dmytrovych