Searching nontrivial magnetic equilibria using the deflated Newton method

Jaime Cisternas*, Andrés Concha

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Nonlinear systems that model physical experiments often have many equilibrium configurations, and the number of these static solutions grows with the number of degrees of freedom and the presence of symmetries. It is impossible to know a priori how many equilibria exist and which ones are stable or relevant, therefore from the modeler's perspective, an exhaustive search and symmetry classification in the space of solutions are necessary. With this purpose in mind, the method of deflation (introduced by Farrell as a modification of the classic Newton iterative method) offers a systematic way of finding every possible solution of a set of equations. In this contribution we apply deflated Newton and deflated continuation methods to a model of macroscopic magnetic rotors, and find hundreds of new equilibria that can be classified according to their symmetry. We assess the benefits and limitations of the method for finding branches of solutions in the presence of a symmetry group, and explore the high-dimensional basins of attraction of the method in selected 2-dimensional sections, illustrating the effect of deflation on the convergence.

Original languageEnglish
Article number114468
Pages (from-to)1-11
Number of pages11
JournalChaos, Solitons and Fractals
Volume179
DOIs
StatePublished - Feb 2024

Bibliographical note

Publisher Copyright:
© 2024 Elsevier Ltd

Keywords

  • Basins of attraction
  • Deflation
  • Magnets
  • Newton method
  • Symmetry

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