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Understanding the call of the monopole

Flicker, Felix ORCID: https://orcid.org/0000-0002-8362-1384 2022. Understanding the call of the monopole. Science 378 (6625) , p. 1177. 10.1126/science.ade2301

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Abstract

Noise is often thought of as merely a hindrance to detecting a signal, but it frequently contains vital clues to otherwise hidden behavior. Recently, noise has been used to hunt for elusive particles called emergent magnetic monopoles, which are predicted to exist within crystals called spin ices (1). Monopoles would feature a magnetic charge that resembles the north pole of a magnet moving independently of the south pole. In 2019, the first noise measurements on monopole dynamics revealed distinctive spontaneous noise in the magnetization of spin ices (2). However, the noise differed from the simplest expectations for magnetization coming from moving magnetic particles. On page 1218 of this issue, Hallén et al. (3) propose that natural constraints in a spin ice restrict monopole motions to a lattice (within the spin ice crystal) that bears a fractional number of dimensions (known as a fractal). Understanding the nature of monopoles in spin ice might have important practical uses, in much the same way that understanding the nature of electrons facilitated modern electronics.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Physics and Astronomy
Date of First Compliant Deposit: 22 December 2022
Date of Acceptance: 6 December 2022
Last Modified: 06 Jan 2024 03:10
URI: https://orca.cardiff.ac.uk/id/eprint/155233

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