THE NUMERICAL STUDY OF DYNAMIC SUSCEPTIBILITY OF THE LAYERED FERROELECTRIC STRUCTURE

• Published in: International Journal of Innovative Research in Advanced Engineering Vol. 8; no. 12; pp. 344 - 347
• Main Author: Gunawan, Vincensius
• Format: Journal Article
• Language: English
• Published: 31.12.2021
• ISSN: 2349-2163; 2349-2163
• DOI: 10.26562/ijirae.2021.v0812.004

In this study, we focused on the structure where a ferroelectric material (FE b) is sandwiched by the other type of ferroelectric material (FE a). The susceptibility is an important parameter which is determining the response of the materials to the external fields. In the numerical study, the susceptibility of the layered structure is obtained by applying the effective medium approach. The layered structure which is consisted of two or more different materials can be treated as one unit material which possesses effective susceptibility. This effective susceptibility is required when we study the optical behaviour of the layered structure. Here, we used entire-cell effective medium approximation. In this approximation, each layer of the ferroelectrics is considered to be comprised of several lattices. Then, by considering Maxwell continuity of fields across the lattices, the Landau-Khalatnikov (LK) equations of motion for each lattice are solved simultaneously to get the effective susceptibility of the layered system. In the calculation, we use parameters for FE which illustrates BaTiO3 while parameters for FE b are randomly vary. We found that the number of lattices in each layer affect the value of the effective susceptibility. We also found that an effective medium with two close resonance frequencies can be obtained when the difference of two resonance frequencies of the composed materials is around one percent of the higher frequency.