Volume 104, Number 6, December 2013
|Number of page(s)||5|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||23 January 2014|
Domain kinetics in ferroelectric films
1 School of Physical Sciences, Jawaharlal Nehru University - New Delhi-110067, India
2 Brahmananda Keshab Chandra College - Kolkata-700108, India
3 Visva-Bharati - Santiniketan-731236, India
Received: 15 October 2013
Accepted: 16 December 2013
We study domain kinetics in ferroelectric films, subsequent to a rapid quench below the critical temperature. We model the kinetics via the time-dependent Ginzburg-Landau (TDGL) equation for the Ginzburg-Landau-Devonshire (GLD) free energy, which is a functional of the electric polarization vector . The nature of ordering dynamics depends on the strength of coupling between Px and Py. For , domain growth is mediated by the annihilation of vortex defects with the growth law . For , the corresponding defects are sharp interfaces between four-fold-degenerate ground states. The resultant growth law is purely diffusive: .
PACS: 64.75.Gh – Phase separation and segregation in model systems (hard spheres, Lennard-Jones, etc.) / 77.80.Dj – Domain structure; hysteresis / 68.35.Rh – Phase transitions and critical phenomena
© EPLA, 2013
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