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

Titelangaben

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

Dies ist die aktuelle Version des Eintrags.

Abstract

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.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Keywords: Ferrogranulate mixture; transient network; viscoelastic phase separation; Langevin dynamics simulation; susceptible dipolar hard spheres; field induced network unknotting
Institutionen der Universität: Fakultäten
Fakultäten > Fakultät für Mathematik, Physik und Informatik
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Ehemalige ProfessorInnen
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Experimentalphysik V
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Ehemalige ProfessorInnen > Lehrstuhl Experimentalphysik V - Univ.-Prof. Dr. Ingo Rehberg
Profilfelder
Profilfelder > Advanced Fields
Profilfelder > Advanced Fields > Nichtlineare Dynamik
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
Eingestellt am: 19 Jun 2023 06:41
Letzte Änderung: 19 Jun 2023 06:41
URI: https://eref.uni-bayreuth.de/id/eprint/81369

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