The ferroelectric hysteresis dispersion of a two-dimensional ferroelectric model lattice in an ac electric field of amplitude E-0 and frequency omega over a wide range, respectively, is calculated by Monte Carlo simulation based on the Ginzburg-Landau theory on tetragonal-type ferroelectric phase transitions. Given a fixed field amplitude E-0, the hysteresis dispersion as a function of field frequency omega shows a single-peaked pattern, which predicts the existence of a characteristic time responsible for domain switching in an external electric field. The scaling analysis demonstrates that given different field amplitudes E-0, the hysteresis dispersions can be scaled and the characteristic time depends inversely on the field amplitude E-0 over a wide range of E-0, but the large deviation occurs as E-0 is very small or extremely large. (c) 2005 American Institute of Physics.
部门归属
nanjing univ, solid state microstruct lab, nanjing 210093, peoples r china. chinese acad sci, int ctr mat phys, shenyang 110016, peoples r china.;liu, jm (reprint author), nanjing univ, solid state microstruct lab, nanjing 210093, peoples r china;liujm@nju.edu.cn
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