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Our ongoing research addresses, by means of experiments and computersimulations, the aggregation process that takes place in a shaken granularmixture of glass and magnetized steel beads when the shaking amplitude issuddenly decreased. After this quenching, the steel beads form a transientnetwork that coarsens in time into compact clusters, following a viscoelasticphase separation. Here we focus on the quasi-two-dimensional case, analyzing incomputer simulation the effects of a magnetic field parallel to the systemplane. Our results evidence that the field drastically changes the structure ofthe forming network: chains and elongated clusters parallel to the field arefavored whereas perpendicular connecting structures tend to be supressed,leading to the unknotting of the networks observed at zero field. Importantly,we found that moderate field strengths lead to the formation of larger clustersat intermediate time intervals than in the case of weak and strong fields.Moreover, the latter tend to limit the overall growth of the clusters at longertime scales. These results may be relevant in different systems governed bysimilar magnetically driven aggregation processes as, for example, in theformation of iron-rich planetesimals in protoplanetary discs or for magneticseparation systems.

Unknotting of quasi-two-dimensional ferrogranular networks by in-plane homogeneous magnetic fields