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Controlling the coarsening dynamics of ferrogranular networks by means of a vertical magnetic field

Title data

Biersack, Matthias ; Lakkis, Ali ; Richter, Reinhard ; Bilous, Oksana ; Sánchez, Pedro A. ; Kantorovich, Sofia S.:
Controlling the coarsening dynamics of ferrogranular networks by means of a vertical magnetic field.
In: Physical Review E. Vol. 108 (2023) Issue 5 . - 054905.
ISSN 2470-0053
DOI: https://doi.org/10.1103/PhysRevE.108.054905

Official URL: Volltext

Abstract in another language

We are exploring in experiments the aggregation process in a shaken granular mixture of glass and magnetized steel beads, filled in a horizontal vessel, after the shaking amplitude is suddenly decreased. Then the magnetized beads form a transient network that coarsens in time into compact clusters, resembling a viscoelastic phase separation [Tanaka, J. Phys.: Condens. Matter 12, R207 (2000)], where attached beads represent the slow phase. Here we investigate how a homogeneous magnetic field oriented in vertical direction impedes the emergence and growth of the networks. With increasing field amplitude this phase is replaced by a fluctuating arrangement of repelling, isolated steel beads. The experimental results are compared with those of computer simulations. Coarse-grained molecular dynamics confirms the impact of an applied magnetic field on the structural transitions and allows us to investigate long-time regimes and magnetic response not yet accessible in the experiment. It turns out that an applied magnetic field has different impacts, depending on it strength. It can be used either to slow down the dynamics of the structural transitions without changing the type of the resulting phases and only affecting the amount and sizes of clusters, or to fully impede the formation of network-like and compact aggregates of steel beads.

Further data

Item Type: Article in a journal
Refereed: Yes
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 > Chair Experimental Physics V
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics V > Chair Experimental Physics V - Univ.-Prof. Dr. Oliver Bäumchen
Result of work at the UBT: Yes
DDC Subjects: 500 Science
500 Science > 530 Physics
Date Deposited: 29 Nov 2023 06:34
Last Modified: 29 Nov 2023 06:34
URI: https://eref.uni-bayreuth.de/id/eprint/87890