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  • Open Access

Random transverse field effects on magnetic noise in spin systems

Yufei Pei1,2,*, Claudio Castelnovo1, and Roderich Moessner2

  • *Contact author: ypei@pks.mpg.de
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Phys. Rev. B 112, 014416 – Published 10 July, 2025

DOI: https://doi.org/10.1103/rf23-dnk7

Abstract

Motivated by experimental developments in non-Kramers spin-ice materials and the unclear role of disorder therein, we study the impact of random transverse fields on the dynamics of correlated magnetic systems. We model the effect of dilute, randomly placed transverse fields on quantities such as magnetic noise/susceptibility and the diffusivity of topological excitations. We consider a random ferromagnetic Ising chain (RTFIC) as well as three-dimensional spin ice. At low temperatures, both exhibit (sub-)diffusive defect dynamics, i.e., of domain walls and magnetic monopoles, respectively. Introducing sparse transverse fields leads to the emergence of an additional timescale on the order of the single-spin-flip time. We develop a Lindbladian framework that combines Monte Carlo simulations and exact diagonalization which allows us to characterize the dynamics and develop an analytical understanding of the phenomenon. This framework can be benchmarked in detail for the RTFIC. Our findings provide insights into the magnetization dynamics of disordered non-Kramers oxides, such as oxygen-diluted Ho2Ti2O7, and offer a framework for interpreting experimental observations in these systems.

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Phys. Rev. B 112, 014416– Published 10 July, 2025
  • Received 25 February 2025
  • Revised 27 May 2025
  • Accepted 13 June 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Open access publication funded by Max Planck Society.

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