超细磁性粒子系统的类Ising动力学和冻结态
Ising-like dynamics and frozen states in systems of ultrafine magnetic particles
摘要：
我们使用蒙特卡罗模拟来研究老化现象和发生的spingglass相的单畴铁磁纳米粒子系统的偶极相互作用和各向异性能量的综合影响下，不同的组合的位置和取向的障碍。我们发现，磁矩取向本身最好平行于其各向异性轴和总磁化强度的变化是唯一实现的180度翻转的磁矩，在伊辛系统。由于偶极相互作用阻碍了反平行链状结构的形成，反平行链状图案在低温下被冻结，导致自旋玻璃特有的老化现象。与直觉相反，这些老化效应在有序结构中比在无序结构中更明显。
英文摘要：
We use Monte-Carlo simulations to study aging phenomena and the occurence of spinglass phases in systems of single-domain ferromagnetic nanoparticles under the combined influence of dipolar interaction and anisotropy energy, for different combinations of positional and orientational disorder. We find that the magnetic moments oriente themselves preferably parallel to their anisotropy axes and changes of the total magnetization are solely achieved by 180 degree flips of the magnetic moments, as in Ising systems. Since the dipolar interaction favorizes the formation of antiparallel chain-like structures, antiparallel chain-like patterns are frozen in at low temperatures, leading to aging phenomena characteristic for spin-glasses. Contrary to the intuition, these aging effects are more pronounced in ordered than in disordered structures.
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