二维伊辛模型的畴壁动力学  

Domain-wall dynamics in the two-dimensional Ising model

作　　者：赵晓雨[1] 雷晓蔚[2,3] 

机构地区：[1]重庆文理学院技术师范学院,重庆402160 [2]重庆文理学院物理系,重庆402160 [3]重庆市高校微纳米材料工程与技术重点实验室,重庆402160

出　　处：《原子与分子物理学报》2011年第2期355-358,共4页Journal of Atomic and Molecular Physics

基　　金：重庆市教委科学技术研究项目(KJ091212);重庆文理学院科技项目(Y2007YJ40)

摘　　要：表面可以改变纳米磁性薄膜的结构和相变温度,畴壁动力学由此成为研究的重点。本文采用动力学蒙特卡罗模拟方法,对二维Ising模型磁畴界面的非平衡动力学展开数值研究.系统初态设为半正半负,即由完全有序但自旋取向完全相反的两部分组成,其间的磁畴壁随时间生长.通过对磁化标度形式的分析,发现畴壁内外的动力学标度形式虽然相同,但临界指数在数值上却存在很大差异,相差一个β_0=1,这是由初始条件导致的.Surface will change the structure and transition temperature of nanometer magnetic thin film, so many activities have been devoted to the domain-wall dynamics. With Monte Carlo simulations, the non-equilibrium critical dynamics of the two-dimensional Ising model with a magnetic domain interface is numerically studied in this paper. The semi-ordered initial state consists of two fully-ordered domains with opposite spin directions. The domain interface grows as time evolves. The same form of inside domain wall and outside is obtained by analyzing dynamic scaling behavior. The critical exponent of magnetization has very differences between the inside the domain interface and the outside. The difference is β0= 1, it is induced by a semi-ordered initial state.

关 键 词：蒙特卡罗法 动力学行为 磁畴壁 ISING模型 

分 类 号：O411.3[理学—理论物理]