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本文用朗道自由能展开研究了有电畴的铁电薄膜的相变特性。畴壁的存在使自发极化和居里温度降低,使临界尺寸增大。随着温度升高,反转长度离开表面。随着厚度减小,膜将成为单畴。The phase transition characteristics of ferroelectric films with domain structure were studied using Landau free energy expansion. The existence of domain walls reduces both the spontaneous polarization and the Curie temperature, and increases the critical size. The reversal length moves away from the surfaces as temperature increases. As the film becomes thinner, the film will turn into single domain.
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