Dynamic Control of Topological Defects in Artificial Colloidal Ice

TL;DR

This paper demonstrates how external fields can be used to precisely control and manipulate defect lines in artificial colloidal spin ice, enabling potential applications in information storage.

Contribution

It introduces a method to control defect lines in colloidal spin ice using external fields, combining simulations with realistic parameters.

Findings

Defect lines can be grown, shrunk, or moved with external fields.

Asymmetric alternating fields enable ratchet-like control of defect lines.

Potential for fast, dense, and mobile information storage in metamaterials.

Abstract

We demonstrate the use of an external field to stabilize and control defect lines connecting topological monopoles in spin ice. For definiteness we perform Brownian dynamics simulations with realistic units mimicking experimentally realized artificial colloidal spin ice systems, and show how defect lines can grow, shrink or move under the action of direct and alternating fields. Asymmetric alternating biasing fields can cause the defect line to ratchet in either direction, making it possible to precisely position the line at a desired location. Such manipulation could be employed to achieve fast, dense, and mobile information storage in these metamaterials.