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

Title data

Sánchez, Pedro A. ; Miller, Justus ; Kantorovich, Sofia S. ; Richter, Reinhard:
Unknotting of quasi-two-dimensional ferrogranular networks by in-plane homogeneous magnetic fields.
In: Journal of Magnetism and Magnetic Materials. (2019) . - Art.Nr. 166182.
ISSN 0304-8853
DOI: https://doi.org/10.1016/j.jmmm.2019.166182

Abstract in another language

Our ongoing research addresses, by means of experiments and computer simulations, the aggregation process that takes place in a shaken granular mixture of glass and magnetized ferrous alloy beads when the shaking amplitude is suddenly decreased. After this quenching, the magnetized beads form a transient network that coarsens in time into compact clusters, following a viscoelastic phase separation. Here we focus on the quasi-two-dimensional case, analyzing in computer simulation the effects of a magnetic field parallel to the system plane. Our results evidence that the field drastically changes the structure of the forming network: chains and elongated clusters parallel to the field are favored whereas perpendicular connecting structures tend to be supressed, leading to the unknotting of the networks which are observed at zero field. Importantly, we found that moderate field strengths lead to the formation of larger clusters at 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 longer time scales. These results may be relevant in different systems governed by similar magnetically driven aggregation processes as, for example, in the formation of iron-rich planetesimals in protoplanetary discs or for magnetic separation systems.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Ferrogranulate mixture; Transient network; Viscoelastic phase separation; Langevin dynamics simulation; Susceptible dipolar hard spheres; Field induced network unknotting
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics V > Chair Experimental Physics V - Univ.-Prof. Dr. Ingo Rehberg
Profile Fields > Advanced Fields > Nonlinear Dynamics
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 04 Dec 2019 08:04
Last Modified: 04 Dec 2019 08:04
URI: https://eref.uni-bayreuth.de/id/eprint/53471