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Effects of extrapolation length δ on switching time and coercive field

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3 Author(s)
Musleh, Ahmad M. ; Universiti Sains Malaysia (USM), 11800 Penang, Malaysia ; Ong, Lye-Hock ; Tilley, D.R.

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The Landau free energy expression for a ferroelectric thin film studied by Tilley and Zeks [Solid State Commun. 49, 823 (1984)] (Tilley–Zeks model) and the Landau–Khalatnikov dynamic equation are used to study the surface effects (represented by the extrapolation length ±δ) on properties of polarization reversal, namely, switching time τS and coercive field eC. Positive δ models a decrease in the local polarization at surfaces, and negative δ an increase, with a smaller absolute value of δ giving a stronger surface effect. For positive δ, τS and eC decrease with decreasing |δ| while for negative δ, τS and eC increase with decreasing |δ|. Strong surface effects, represented by smaller |δ|, are more profound in thin FE films.

Published in:

Journal of Applied Physics  (Volume:105 ,  Issue: 6 )