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Theoretical study on the influence of surface imperfections on the properties of ferroelectric thin films in first‐order ferroelectric systems
Author(s) -
Lin Shan,
Lü Tianquan,
Cao Wenwu
Publication year - 2006
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200642100
Subject(s) - ferroelectricity , condensed matter physics , materials science , polarization (electrochemistry) , dielectric , hysteresis , phase boundary , thin film , landau theory , imperfect , phase transition , phase (matter) , physics , nanotechnology , optoelectronics , chemistry , linguistics , philosophy , quantum mechanics
A generalized Ginzburg–Landau–Devonshire (GLD) theory is used to study the properties of ferroelectric thin films sandwiched between two metal electrodes with a first‐order phase transition. By taking into account the effect of the imperfect surface layer and a natural boundary condition, the temperature and film‐thickness dependence of the spontaneous polarization and the dielectric susceptibility are calculated. The depolarization field makes the polarization distribution more uniform. In addition, an asymmetric hysteresis loop can be obtained due to the existence of asymmetrical imperfect surface layers. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)