Using Langevin dynamics simulations, we investigate the self-assembly of magnetic nanogels in the presence of applied magnetic fields of moderate strength. We find that even weak fields lead to drastic changes in the structure factors of both, the embedded magnetic nanoparticles and of whole nanogel particles. Nanogels assemble by uniting magnetic particle clusters forming inter-gel bridges. At zero field the average amount of such bridges for a pair of nanogels is close to one, whereas even for weak fields it fastly doubles. Rapid growth of cluster size at low values of the applied field is followed by a broad region of slow increase, caused by the mechanical constraints imposed the polymer matrix. The influence of the latter manifests itself in both, the slow growth of the magnetisation curve at intermediate fields and the slow decay of the total Zeeman energy.

使用Langevin动力学模拟，我们研究了在中等强度的外加磁场作用下磁性纳米凝胶的自组装。我们发现，即使是弱磁场也会导致嵌入的磁性纳米颗粒和整个纳米凝胶颗粒的结构因子发生剧烈变化。纳米凝胶通过结合形成粒子间凝胶桥的磁性粒子簇来组装。在零场时，一对纳米凝胶的这种桥的平均数量接近一个，而即使对于弱场，它也会快速翻倍。在施加的电场值较低的情况下，团簇尺寸快速增长，随后是宽幅的缓慢增长区域，这是由于聚合物基体受到机械约束而引起的。后者的影响体现在两者中，