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Registration Number

0215U002545, 0114U000996 , R & D reports

Title

Study of ferroelectric micro- and nano- domain wall conductivity: theory and experiment.

Head

Morozovska Anna Nikolaevna,

Registration Date

06-01-2016

Organization

Institute of physics NASU

Description

Research aimed at solving fundamental scientific problems of the physics of nonequilibrium states associated with the establishment, description and management of electronic properties of nanostructures in phase transformations in spatially heterogeneous environments. The object of study is the electrical properties of domain walls in ferroelectric materials. The aim of the project is to conduct a comprehensive theoretical and experimental study of the electrical conductivity of the domain walls in ferroelectric materials. Using a phenomenological theory of Ginsburg-Landau-Devonshire and electrostatics theory self-consistent calculations of the electrical conductivity of the domain walls of micro- and nano-domains in ferroelectric semiconductors were performed. The basic conduction mechanisms of domain walls of micro- and nano-domains in ferroelectric semiconductors are established, being the presence of uncompensated bound charge near the wall and the resulting in the field effect, the accumulation of charged and uncharged defects due to flexoelectric effect and deformation potential. Using relaxation type equations with cubic nonlinearity, the dynamics of polarization reversal induced by the field probe for different values of the threshold field. It is shown that the kinetics of domains determined by the anisotropy of the threshold field, the smaller the threshold field, the larger domain. This fact could help to explain the difference of the lengths of the domain and the electrical conductivity of the walls for the X- and Y- cross cuts of LiNbO3 crystal. The results may provide insight into the dynamics of a nontrivial anisotropic polarization reversal and the electrical conductivity of domain walls in a strongly inhomogeneous electric fields.

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Бобровська Ірина Петрівна
Вареник Олександр Вікторович
Морозовська Ганна Миколаївна
Погорецька Ірина Василівна