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  • Letter
  • Open Access

Thermal excitations within and among mesospins in artificial spin ice

Björn Erik Skovdal, Samuel D. Slöetjes, Merlin Pohlit, Henry Stopfel, Vassilios Kapaklis*, and Björgvin Hjörvarsson

  • Department of Physics and Astronomy, Uppsala University, Box 516, 751 20 Uppsala, Sweden

  • *Corresponding author: vassilios.kapaklis@physics.uu.se
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Phys. Rev. B 107, L060406 – Published 13 February, 2023

DOI: https://doi.org/10.1103/PhysRevB.107.L060406

Abstract

We provide experimental and numerical evidence for thermal excitations within and among magnetic mesospins, forming artificial spin ice structures. At low temperatures, a decrease in magnetization and increase in susceptibility is observed with increasing temperature, interpreted as an onset of thermal fluctuations of the magnetic texture within the mesospins. At elevated temperatures a pronounced susceptibility peak is observed, related to thermally induced flipping of the mesospins and a collapse of the remanent state. The fluctuations, while occurring at distinct length and energyscales, are shown to be tunable by the interaction strength of the mesospins.

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Phys. Rev. B 107, L060406– Published 13 February, 2023
  • Received 4 May 2022
  • Revised 21 October 2022
  • Accepted 23 January 2023
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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. Funded by Bibsam.

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