The Spear and the Ring: Emergent Structures in Magnetic Colloidal Suspensions
Abstract
We study from a mathematical point of view the nanoparticle model of a magnetic colloid, presented by G. Klughertz. Our objective is to obtain properties of stable stationary structures that arise in the long-time limit for the magnetic nanoparticles dynamics following this model. In this article, we present a detailed study of two specific structures using techniques from the calculus of variations. The first, called the spear, consists of a chain of aligned particles interacting via a Lennard-Jones potential. We establish existence and uniqueness results, derive bounds on the distances between neighboring particles, and provide a sharp asymptotic description as the number of particles tends to infinity. The second structure, the ring, features particles uniformly distributed along a circle. We prove its existence and uniqueness and derive an explicit formula for its radius.
Keywords
Cite
@article{arxiv.2504.02379,
title = {The Spear and the Ring: Emergent Structures in Magnetic Colloidal Suspensions},
author = {Raphaël Côte and Clémentine Courtès and Guillaume Ferrière and Ludovic Godard-Cadillac and Yannick Privat},
journal= {arXiv preprint arXiv:2504.02379},
year = {2025}
}