| Issue |
Emergent Scientist
Volume 2, 2018
IPT2017
|
|
|---|---|---|
| Article Number | 3 | |
| Number of page(s) | 6 | |
| DOI | https://doi.org/10.1051/emsci/2018003 | |
| Published online | 14 September 2018 | |
Research Article
Critical density for the stability of a 2D magnet array
1
Ecole Polytechnique,
91128
Palaiseau Cedex, France
2
LadHyX, UMR 7646 du CNRS, Ecole Polytechnique,
91128
Palaiseau Cedex, France
* e-mail: corentin.reiss@polytechnique.edu
Received:
7
October
2017
Accepted:
9
July
2018
Confining a given number of magnets with vertically aligned moments on a non-magnetic surface creates a 2D magnet array, self-organized by repulsive forces in a hexagonal crystal-like network. Increasing areal density leads to a dramatic collapse of the structure where magnets finally stick together. We study the origin of this collapse and its critical density both experimentally, by either increasing the number of magnets or reducing the area, and theoretically, by using a dipole model. We suggest the collapse occurs when magnetic forces or torques created by irregularities overcome gravity. Transition from torque-driven to force-induced mechanism is observed when the critical density increases.
© C. Reiss et al., Published by EDP Sciences, 2018
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