In this research, we employ Brownian dynamics simulations, density functional theory, and mean-field theory to explore the profound influence of shape anisotropy of magnetic nanoplatelets on suspension magnetic response. Each platelet is modelled as an oblate cylinder with a longitudinal point dipole, with an emphasis on strong dipolar interactions conducive to self-assembly. We investigate static structural and magnetic properties, characterising the system through pair distribution function, static structure factor, and cluster-size distribution. The findings demonstrate that shape-specific interactions and clustering lead to significant changes in reorientational relaxation times. Under zero field, distinctive modes in the dynamic magnetic susceptibility identify individual particles and particle clusters. In the presence of an applied field, the characteristic relaxation time of clusters increases, while that of single particles decreases. This research provides insights into the intricate interplay between shape anisotropy, clustering, and magnetic response in platelet suspensions, offering valuable perspectives for recent experimental observations.

中文翻译：

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磁性血小板悬浮液的结构和动力学

在本研究中，我们采用布朗动力学模拟、密度泛函理论和平均场理论来探讨磁性纳米片形状各向异性对悬浮磁响应的深远影响。每个片晶被建模为具有纵向点偶极子的扁圆柱体，重点是有利于自组装的强偶极相互作用。我们研究静态结构和磁特性，通过对分布函数、静态结构因子和簇大小分布来表征系统。研究结果表明，特定形状的相互作用和聚类会导致重新定向弛豫时间发生显着变化。在零场下，动态磁化率的独特模式可识别单个颗粒和颗粒簇。在存在外加场的情况下，团簇的特征弛豫时间增加，而单个粒子的特征弛豫时间减少。这项研究深入了解了血小板悬浮液中形状各向异性、聚类和磁响应之间复杂的相互作用，为最近的实验观察提供了宝贵的视角。