Dynamic stabilisation of mesospin chains

TL;DR

This paper introduces a one-dimensional magnetic system with short-range interactions that exhibits a stable long-range ordered phase at finite temperatures, revealing new insights into shape anisotropy effects in magnetic metamaterials.

Contribution

It demonstrates how realistic stray-field potentials and dimensionality reduction lead to stable magnetic order in a 1D system, contrasting with traditional models.

Findings

Stable long-range order persists at finite temperatures.

Shape anisotropy influences magnetic excitation spectrum.

Dimensionality reduction stabilizes magnetic order.

Abstract

We present a rare example of a one-dimensional system with short-range range interactions for which a self-stabilizing long-range ordered phase persists to finite temperatures. Our model offers a new perspective on the origins of shape anisotropy on the mesoscopic scale in magnetic metamaterials. Specifically, we show how the combination of a physically realistic stray-field potential and the spatial dimensionality of the system can reduce the effective dimensionality of classical magnetic mesospins. The resulting emergent constraints on the magnetic excitation spectrum underpin the observed ordering, in stark contrast to the behaviour of analogous one-dimensional models with strictly isotropic spins.