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Theoretical Study on Dynamic Physical Properties of Ferroelectric Thin Films Containing Surface Transition Layers

Author: LiChunYu
Tutor: LvTianQuan
School: Harbin Institute of Technology
Course: Condensed Matter Physics
Keywords: Ferroelectric thin films Spontaneous polarization Surface transition layer Dynamic physical properties
CLC: O484.4
Type: Master's thesis
Year: 2009
Downloads: 36
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Abstract


In recent years, as people of ferroelectric thin films extensive and in-depth study, it has found some special physical properties of ferroelectric thin films, in particular ferroelectric thin films promote memory access devices on the people ferroelectric thin film physical properties of theoretical studies of enthusiasm. The main way of theoretical research the Devonshire thermodynamic phenomenological theory and the transverse field Ising model. So far, on the basis of the Landau theory has some concept of static and dynamic theoretical study of the physical properties of ferroelectric thin films, but in the study of the surface of the film and the size effect are generally introduced extrapolation length film to represent The surface free energy function. This paper GLD phenomenological theory and Landau-Khalatnikov equation theoretical study of dynamic physical properties of ferroelectric thin films were characterized, and introduced the concept of the surface of the buffer layer on the film surface effect. This thesis is focused on the surface of the buffer layer film polarization properties and dielectric properties of these two aspects of the study of theoretical research are described as follows: First, this thesis, the polarization changes with temperature and applied electric field. When the system in which the temperature changes, the polarization in the ferroelectric thin film will experience a balanced state, the non-equilibrium state to the equilibrium process, the time required by this process is only in the order of nanometers, so in experimental difficult to observe, in this paper, we simulate the polarization changes in this process; When applied electric field, the polarization of the film will change with the dynamic changes of the electric field, in particular, to join an alternating electric field when, when the rotation of the dipoles in ferroelectric thin films can keep up with the system applied alternating electric field, the polarization will be with the electric field periodic changes. And when the frequency of the applied electric field is too high, the rotation of the dipoles will not keep up with the changes in the applied electric field generates a certain amount of relaxation. This thesis is an applied electric field to observe the spontaneous polarization when the existence of the surface of the buffer layer on the dynamic response of the electric field. Secondly, the study of the polarization rate with temperature and the change of the applied electric field. Through the study of the theory of this paper, we see the impact of the different parameters of the transition layer on the distribution and dynamics of polarization and polarization rate the same time, we also observed when the size of the film is reduced polarization appears average polarization and phase transition temperature decreases and the film internal polarization rate increase size effect.

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CLC: > Mathematical sciences and chemical > Physics > Solid State Physics > Thin Film Physics > The nature of the films
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