Comment on "Hysteretic transition between states of a filled hexagonal magnetic dipole cluster"

Titelangaben

Völkel, Simeon ; Hartung, Stefan ; Rehberg, Ingo:
Comment on "Hysteretic transition between states of a filled hexagonal magnetic dipole cluster".
In: Journal of Magnetism and Magnetic Materials. Bd. 559 (2022) . - 169520.
ISSN 0304-8853
DOI: https://doi.org/10.1016/j.jmmm.2022.169520

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Abstract

In the paper “Smith et al. (2022)” a hysteretic transition between two stable arrangements of a cluster of seven dipoles is presented. The relative strength of the center dipole in a hexagonal arrangement serves as the bifurcation parameter. The authors clearly demonstrate the existence of two instabilities accompanied by discontinuous jumps of the dipole arrangement, but leave the question about the nature of these instabilities unanswered. This comment clarifies the nature of the two instabilities: the first one is a symmetry-breaking sub-critical bifurcation with parabolic scaling of the magnetic potential energy difference between the two branches, and the second one is a fold with its characteristic scaling in the form of a semi-cubic parabola.