Phase diagram for the striped phase in the two-dimensional dipolar Ising model

被引:37
作者
Arlett, J [1 ]
Whitehead, JP [1 ]
MacIsaac, AB [1 ]
DeBell, K [1 ]
机构
[1] TRENT UNIV,PETERBOROUGH,ON K9J 7B8,CANADA
来源
PHYSICAL REVIEW B | 1996年 / 54卷 / 05期
关键词
D O I
10.1103/PhysRevB.54.3394
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Ising models with competing dipolar and ferromagnetic short-range interactions can exhibit a number of ordered domain phases. In the absence of an external magnetic field, the square lattice version of this model exhibits a smectic striped phase at low temperatures. On heating the smectic phase melts to yield an orientationally disordered tetragonal phase. In this paper we investigate the effect of a magnetic field on this transition by means of Monte Carlo simulations. The simulations show that application of a field causes the stripes to break up and the minority spins form elongated islands. The phase boundary of the smectic striped phase is obtained for a particular ratio of exchange constant J to the dipolar interaction strength g. The results are discussed and compared with the predictions of mean field theory and previous simulations on a dipolar lattice gas model on a triangular lattice.
引用
收藏
页码:3394 / 3402
页数:9
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