含纳米Fe颗粒绝缘膜的偶极玻璃行为
Dipolar-glass behaviour of an insulating film containing nanogranular Fe particles
摘要：
我们进行大都会蒙特卡罗模拟的行为的绝缘材料的膜含有磁性纳米粒子的分布。我们假定这些粒子只通过偶极力相互作用，发现它们在低T下的行为表现出自旋玻璃的特征，在冻结T_f时，线性磁化率和比热都出现极大值。我们得到了自旋玻璃序参量随温度的变化关系，并计算了系统中心自旋的时间自相关。我们发现这些结果与中心自旋局域场的方差和平均值的温度依赖性是一致的。
英文摘要：
We perform Metropolis Monte Carlo simulations of the behaviour of a film of insulating material containing a distribution of magnetic nanoparticles. We assume that these particles only interact through dipolar forces and we find that their behaviour at low T shows characteristics of a spin-glass with a freezing T_f at which the linear susceptibility and the specific heat show a maximum. We obtain the spin glass order parameter as a function of temperature and we also calculate the time auto-correlation of the spin at the center of the system. We find that these results are consistent with the temperature dependence of the variance and the mean of the local field at the central spin.
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