Volume 2, 2018
|Number of page(s)||6|
|Published online||14 September 2018|
Critical density for the stability of a 2D magnet array
Palaiseau Cedex, France
2 LadHyX, UMR 7646 du CNRS, Ecole Polytechnique, 91128 Palaiseau Cedex, France
* e-mail: email@example.com
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
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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