计算物理 ›› 2004, Vol. 21 ›› Issue (3): 339-345.

• 研究论文 • 上一篇    下一篇

二维无规混合磁性系统磁特性的微磁学及Monte Carlo研究

翁臻臻1, 冯倩1, 肖艳1, 李永森1, 黄志高1,2   

  1. 1. 福建师范大学物理系, 福建 福州 350007;
    2. 南京大学固体微结构国家重点实验室, 江苏 南京 210093
  • 收稿日期:2003-02-28 修回日期:2003-09-23 出版日期:2004-05-25 发布日期:2004-05-25
  • 作者简介:翁臻臻(1979-),女,福建福清,硕士,从事纳米磁性材料的理论研究.
  • 基金资助:
    教育部高等学校骨干教师资助计划;福建省自然科学基金;创新人才基金(E0010022,2000E146和E032002)资助项目

Micromagnetism and Monte Carlo Simulation of Magnetism of a Two-Dimension Diluted System

WENG Zhen-zhen1, FENG Qian1, XIAO Yan1, LI Yong-sen1, HUANG Zhi-gao1,2   

  1. 1. Department of Physics, Fujian Normal University, Fuzhou 350007, China;
    2. National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
  • Received:2003-02-28 Revised:2003-09-23 Online:2004-05-25 Published:2004-05-25

摘要: 采用能量极小原理的微磁学及Monte Carlo方法对异类自旋组成混合Heisenberg自旋体系进行模拟计算,研究了二维铁磁反铁磁无规混合系统的磁特性.发现了二维无规混合磁性系统存在M-H磁化曲线的阶梯效应.通过一维Ising模型及系统能量、自旋组态的研究,发现小自旋数目的反铁磁耦合系统是产生M-H阶梯效应的根本原因.

关键词: 微磁学, 阶梯效应, 磁化强度, 混合磁系统

Abstract: Magnetic feature of a two-dimension ferromagnetic/antiferromagnetic random diluted magnetic system is studied by micromagnetism and Monte Carlo method. The step effect of M-H magnetization curve is found in this system, and discussed with the one-dimension Ising model, which covers the energy of system and the spin configuration. It's found that the step effect can be produced in the antiferromagnetic coupling system with small number of spins.

Key words: micromagnetism, step effect, magnetization, diluted magnetic system

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