【摘要】 采用能量极小原理的微磁学方法对异类自旋组成混合Heisenberg自旋体系进行模拟计算,研究比较自由边界条件和周期边界条件下的二维铁磁/反铁磁无规混合系统的磁特性,发现在自由边界条件(FREE)和周期边界条件(PERIOD)下的二维无规混合磁性系统的M-H磁化曲线的阶梯效应中存在异同.通过二维Ising模型和自旋组态的研究,解释自由边界条件下系统的平均自由度较周期边界条件下系统的自由度大是产生阶梯效应差异的原因.更多还原

【Abstract】 The magnetism of a twodimension ferromagnetic/antiferromagnetic random diluted magnetic system with free boundary condition and period boundary condition are studied and compared by micromagnetism methods. Difference is found in the step effect of M-H　magnetization curve in the two systems. The step effects are discussed with the twodimension Ising model and the spin configuration. It’s found that the mean freedom of a system with free boundary condition more than that of a system with period boundary condition results in the difference in the step effect of M-H　magnetization curve.更多还原