中国物理B ›› 2006, Vol. 15 ›› Issue (5): 1081-1085.doi: 10.1088/1009-1963/15/5/036

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Critical properties of XY model on two-dimensional layered magnetic films

王　漪, 刘晓彦, 孙　雷, 张　兴, 韩汝琦   

  1. Institute of Microelectronics, Peking University, Beijing 100871, China
  • 收稿日期:2005-10-17 修回日期:2006-02-27 出版日期:2006-05-20 发布日期:2006-05-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10234010).

Critical properties of XY model on two-dimensional layered magnetic films

Wang Yi (王　漪), Liu Xiao-Yan (刘晓彦), Sun Lei (孙　雷), Zhang Xing (张　兴), Han Ru-Qi (韩汝琦)   

  1. Institute of Microelectronics, Peking University, Beijing 100871, China
  • Received:2005-10-17 Revised:2006-02-27 Online:2006-05-20 Published:2006-05-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10234010).

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摘要： Using Monte Carlo simulations, we have investigated the classical $XY$ model on triangular lattices of ultra-thin film structures with middle ferromagnetic layers sandwiched between two antiferromagnetic layers. The internal energy, the specific heat, the chirality and the chiral susceptibility are calculated in order to clarify phase transitions and critical phenomena. From the finite-size scaling analyses, the values of critical exponents are determined. In a range of interaction parameters, we find that the chirality steeply goes up as temperature increases in a temperature range; correspondingly the value of a critical exponent for this change is estimated.

Abstract: Using Monte Carlo simulations, we have investigated the classical $XY$ model on triangular lattices of ultra-thin film structures with middle ferromagnetic layers sandwiched between two antiferromagnetic layers. The internal energy, the specific heat, the chirality and the chiral susceptibility are calculated in order to clarify phase transitions and critical phenomena. From the finite-size scaling analyses, the values of critical exponents are determined. In a range of interaction parameters, we find that the chirality steeply goes up as temperature increases in a temperature range; correspondingly the value of a critical exponent for this change is estimated.

Key words: layered XY model, critical phenomena, ultra-thin magnetic film

中图分类号:  (Classical spin models)

  • 75.10.Hk
68.55.-a (Thin film structure and morphology) 75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)) 75.40.Cx (Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)) 75.70.Ak (Magnetic properties of monolayers and thin films)