Order Parameter Distribution and Phase Transition Temperature for a Thin Film With Asymmetric Boundaries

The phenomenological theory was developed for the ferroic phase transition in a thin film with asymmetric boundary conditions which simulate the real situation of a film on the substrate or a layer between two different materials. The solutions of the boundary value problem for the order parameter w...

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Bibliographic Details
Published in:Ferroelectrics 2012-01, Vol.437 (1), p.8-15
Main Authors: Gabbasova, K. R., Pirozerskii, A. L., Charnaya, E. V., Tien, Cheng, Bugaev, A. S.
Format: Article
Language:English
Subjects:
77.55.-g
77.80.B
asymmetric boundary conditions
Asymmetry
Boundaries
Boundary conditions
Extrapolation
Film thickness
Landau theory
Mathematical models
Order parameters
Phase transformations
Phase transition
Phase transitions
Phenomenology
size effect
Temperature effects
thin film
Thin films
weakened size effect
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Summary:The phenomenological theory was developed for the ferroic phase transition in a thin film with asymmetric boundary conditions which simulate the real situation of a film on the substrate or a layer between two different materials. The solutions of the boundary value problem for the order parameter were obtained numerically for some particular sets of phenomenological parameters in the Landau expansion and extrapolation lengths. The main attention was focused on the case of opposite signs of the extrapolation lengths at film surfaces. It was shown that the mean order parameter is close to that in bulk and phase transition temperature remains weakly dependent on film thickness when the extrapolation lengths have similar absolute values and opposite signs.
ISSN:0015-0193
1563-5112
DOI:10.1080/00150193.2012.742355