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Title: Dependence of the ferroelectric domain shape on the electric field of the microscope tip

A theory of an equilibrium shape of the domain formed in an electric field of a scanning force microscope (SFM) tip is proposed. We do not assume a priori that the domain has a fixed form. The shape of the domain is defined by the minimum of the free energy of the ferroelectric. This energy includes the energy of the depolarization field, the energy of the domain wall, and the energy of the interaction between the domain and the electric field of the SFM tip. The contributions of the apex and conical part of the tip are examined. Moreover, in the proposed approach, any narrow tip can be considered. The surface energy is determined on the basis of the Ginzburg-Landau-Devonshire theory and takes into account the curvature of the domain wall. The variation of the free energy with respect to the domain shape leads to an integro-differential equation, which must be solved numerically. Model results are illustrated for lithium tantalate ceramics.
Authors:
 [1] ;  [2]
  1. Institute of Refrigeration and Biotechnology, National Research University of Information Technologies, Mechanics and Optics, Kronverksky pr. 49, 197101 St. Petersburg (Russian Federation)
  2. SIX Research Centre, Brno University of Technology, Technick√° 12, 616 00 Brno (Czech Republic)
Publication Date:
OSTI Identifier:
22494748
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 118; Journal Issue: 7; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CERAMICS; DEPOLARIZATION; ELECTRIC FIELDS; FERROELECTRIC MATERIALS; GINZBURG-LANDAU THEORY; LITHIUM COMPOUNDS; MICROSCOPES; SURFACE ENERGY; TANTALATES