ERef Bayreuth

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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. Vol. 499 (2020) . - 166182.
ISSN 0304-8853
DOI: https://doi.org/10.1016/j.jmmm.2019.166182

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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 steel beads when the shaking amplitude is suddenly decreased. After this quenching, the steel 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 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 Faculties > Faculty of Mathematics, Physics und Computer Science Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Former Professors Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics V Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Former Professors > Chair Experimental Physics V - Univ.-Prof. Dr. Ingo Rehberg Profile Fields Profile Fields > Advanced Fields Profile Fields > Advanced Fields > Nonlinear Dynamics
Result of work at the UBT:	Yes
DDC Subjects:	500 Science > 530 Physics
Date Deposited:	19 Jun 2023 06:41
Last Modified:	19 Jun 2023 06:41
URI:	https://eref.uni-bayreuth.de/id/eprint/81369

Available Versions of this Item

Unknotting of quasi-two-dimensional ferrogranular networks by in-plane homogeneous magnetic fields. (deposited 04 Oct 2019 09:12)
- Unknotting of quasi-two-dimensional ferrogranular networks by in-plane homogeneous magnetic fields. (deposited 19 Jun 2023 06:41) [Currently Displayed]