论文标题
二进制超磁混合物中的磁静电反应和野外晕圈
Magnetostatic response and field-controlled haloing in binary superparamagnetic mixtures
论文作者
论文摘要
如今，不仅基于磁性纳米颗粒，还基于具有液体和聚合物载体的多种尺寸和磁性特性的多种组件，由于其独特而多功能的宏观镜头对施加的磁场的独特和多功能的宏观响应，因此在多个具有不同大小和磁性特性的组件上变得越来越广泛。后者的变异性与多组分系统中空间不均匀性引起的高度不均匀的内部场中的磁相互作用的复杂相互作用有关。在这项工作中，我们介绍了二进制超顺磁系统的组合分析和模拟研究，该系统含有液体和固体载体基质中的纳米簇和分散的单域纳米颗粒。我们研究了这些系统在浓度和相互作用能量范围内的平衡磁反应。事实证明，尽管二元固体的磁化可以在理想的超磁气体的高于和下方，这取决于分散相和颗粒间相互作用的浓度，但液体载体中的系统具有很高的磁反应性。在液体中，观察到最初均匀分散相位的纳米簇附近的空间重新分布 - 这种效果让人联想到所谓的``卤代''效应先前对微型和米尔利大型的实验观察到的效果。
Nowadays, magnetoresponsive soft materials, based not simply on magnetic nanoparticles, but rather on multiple components with distinct sizes and magnetic properties, both in liquid and polymeric carriers, are becoming more and more wide-spread due to their unique and versatile macroscopic response to an applied magnetic field. The variability of the latter is related to a complex interplay of the magnetic interactions in a highly non-uniform internal fields caused by spatial inhomogeneity in multicomponent systems. In this work, we present a combine analytical and simulation study of binary superparamagnetic systems, containing nanoclusters and dispersed single-domain nanoparticles, both in liquid and solid carrier matrices. We investigate the equilibrium magnetic response of these systems in wide ranges of concentrations and interaction energies. It turns out that, while the magnetisation of a binary solid can be both above and below that of an ideal superparamagnetic gas, depending on the concentration of the dispersed phase and the interparticle interactions, the system in a liquid carrier is highly magnetically responsive. In liquid, a spatial redistribution of the initially homogeneously dispersed phase in the vicinity of the nanocluster is observed -- the effect that is reminiscent of the so-called ``haloing'' effect previously observed experimentally on micro- and milli-scales.
