The Electric Susceptibility of Bi-Layers Ferroelectrics

*Vincensius Gunawan  -  Department of Physics, Universitas Diponegoro, Indonesia
Ngurah Ayu Ketut Umiati  -  Department of Physics, Universitas Diponegoro, Indonesia
Agus Subagio  -  Department of Physics, Universitas Diponegoro, Indonesia
Received: 14 May 2019; Accepted: 2 Jun 2019; Published: 20 Jun 2019; Available online: 15 Jun 2019.
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Language: EN
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Abstract
In order to enhance insight of layered structure, we perform numerical calculation to obtain the dynamic electric susceptibility in bi-layers ferroelectrics. Since susceptibility is a parameter which gives response to the external field, then determination of this parameter is important. A lattice model is employed to slice bilayer structure into several lattices.  Then, Landau-Khalatnikov equation of motion is used in each lattice to construct a matrix equation of equation of motion.  The solution is obtained by applying entire-cell effective medium.  We find that the homogeneity of dynamic polarization is different from homogeneity of the single individual layer due to the existence of interlayer interaction.  As a result, the electric susceptibility is also altered.  It is also noticed that there is a relation between the homogeneity of dynamic polarization and the value of electric susceptibility near resonant frequency.  The higher the homogeneity, the bigger the values of susceptibility will be. 
Keywords
Electric Susceptibility; Polarization; Bilayer Ferroelectric

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