Volume 99, Number 4, August 2012
|Number of page(s)||6|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||30 August 2012|
Electrostatic coupling and interface intermixing in ferroelectric superlattices
1 Department of Physics, University of Malaya - 50603 Kuala Lumpur, Malaysia
2 School of Physics, Universiti Sains Malaysia - 11800 Minden, Penang, Malaysia
3 Department of Engineering Physics, Electronics and Mechanics, Graduate School of Engineering, Nagoya Institute of Technology - Nagoya 466-8555, Japan
Received: 23 May 2012
Accepted: 30 July 2012
A thermodynamic model is developed to study electrostatic coupling and interface intermixing in superlattices comprising alternate layers of ferroelectrics and paraelectrics. Interface intermixing leads to inhomogeneous internal electric field and polarization in superlattices. The spatial distribution of polarization extends into the layer over a distance governed by its correlation length. Periodic modulation of the internal electric field and polarization in superlattices are correlated. Interface intermixing enhances the depolarization field of superlattices; however, it has a negligible effect on polarization and transition temperature. The internal electric field, originating from the electrostatic coupling between ferroelectric layers, plays a dominant role in determining the properties of superlattices.
PACS: 68.65.Cd – Superlattices / 77.22.Ej – Polarization and depolarization / 77.80.bn – Strain and interface effects
© EPLA, 2012
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