Monte-Carlo模拟偶极缺陷对铁电系统的影响  

Mote-Carlo Simulation of the Switching Behavior in Ferroelectrics with Dipolar Defects

作　　者：吴银忠[1] 姚东来[1] 李振亚[1] 

机构地区：[1]苏州大学物理系,江苏苏州215006

出　　处：《哈尔滨理工大学学报》2002年第6期32-33,36,共3页Journal of Harbin University of Science and Technology

摘　　要：应用晶格基Monte-Carlo法模拟偶极缺陷的二维铁电系统的开关特征.将两种类型偶极缺陷引入晶格基铁电体系中,一种类型偶极缺陷的位置偏离格点;另一种缺陷为不可翻转的偶极子.已证实引入偶极缺陷使矫顽场强下降.第一种类型偶极缺陷在开关过程中会造成偶极方向两次连续的90°取向;而第二种类型偶极缺陷铁电系统的开关特性几乎全是一种简单的180°翻转.A lattice - based Monte Carlo method is applied to simulate the swithching behavior of the two dimensional ferroelectric system with dipolar defects. Two types of the dipolar defects are introduced into the lattice - based ferroelectric system. One type of the dipolar defects is that the position of the dipole displaces away from the lattice site, the other is the irreversible dipole. It is shown that the introducing of the dipolar defects will decrease the coercive field. The first type of the dipolar defects will cause two successive 90°rotations of the direction of the dipoles during the process of switching, while the swithching behavior of the ferroelectric system with the second type of the dipolar defects shows almost a single 180°flipping.

关 键 词：MONTE-CARLO模拟 偶极缺陷 开关行为 铁电体 

分 类 号：TM221[一般工业技术—材料科学与工程]