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摘要翻译：
利用Monte-Carlo模拟方法研究了单畴铁磁纳米颗粒在偶极相互作用和各向异性能的共同作用下，在不同位置和取向无序组合下的老化现象和spinglass相的出现。我们发现磁矩的取向最好平行于各向异性轴，总磁化强度的变化仅由磁矩的180度翻转实现，就像Ising系统一样。由于偶极相互作用有利于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。
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英文标题：
《Ising-like dynamics and frozen states in systems of ultrafine magnetic
particles》
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作者：
Stefanie Russ, Armin Bunde
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最新提交年份：
2007
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分类信息：
一级分类：Physics 物理学
二级分类：Disordered Systems and Neural Networks 无序系统与神经网络
分类描述：Glasses and spin glasses; properties of random, aperiodic and quasiperiodic systems; transport in disordered media; localization; phenomena mediated by defects and disorder; neural networks
眼镜和旋转眼镜；随机、非周期和准周期系统的性质；无序介质中的传输；本地化；由缺陷和无序介导的现象；神经网络
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一级分类：Physics 物理学
二级分类：Statistical Mechanics 统计力学
分类描述：Phase transitions, thermodynamics, field theory, non-equilibrium phenomena, renormalization group and scaling, integrable models, turbulence
相变，热力学，场论，非平衡现象，重整化群和标度，可积模型，湍流
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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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PDF链接：
https://arxiv.org/pdf/704.058
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