Physics – Condensed Matter – Materials Science
Scientific paper
2004-06-16
Physics
Condensed Matter
Materials Science
16 pages, 3 figures, expanded version of paper submitted to PRL
Scientific paper
10.1063/1.1866483
Nanoscale polarization switching in ferroelectric materials by Piezoresponse Force Microscopy (PFM) in weak and strong indentation limits is analyzed using exact solutions for electrostatic and coupled electroelastic fields below the tip. It is proposed that the tip-induced domain switching can be mapped on the Landau theory of phase transitions with the domain size as an order parameter. For a point charge interacting with a ferroelectric surface, switching of both first and second order is possible depending on the charge-surface separation. For a realistic tip shape, the domain nucleation process is first order in charge magnitude and polarization switching occurs only above a critical tip bias. In pure ferroelectric or ferroelastic switching, the late stages of the switching process can be described using point charge/force model and arbitrarily large domains can be created; however, the description of the early stages of nucleation process when domain size is comparable with the tip radius of curvature requires exact field structure to be taken into account.
Baddorf Arthur P.
Gruverman Alexei
Kachanov Mark
Kalinin Sergei V.
Karapetian Edgar
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