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  • Letter
  • Open Access

Magnetic order and long-range interactions in mesoscopic Ising chains

Christina Vantaraki1,*, Matías P. Grassi1, Kristina Ignatova2, Michael Foerster3, Unnar B. Arnalds2, Daniel Primetzhofer1, and Vassilios Kapaklis1,†

  • *Contact author: christina.vantaraki@physics.uu.se
  • †Contact author: vassilios.kapaklis@physics.uu.se
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Phys. Rev. B 111, L020408 – Published 16 January, 2025

DOI: https://doi.org/10.1103/PhysRevB.111.L020408

Abstract

We investigate the design of magnetic ordering in one-dimensional mesoscopic magnetic Ising chains by modulating long-range interactions. These interactions are affected by geometrical modifications to the chain, which adjust the energy hierarchy and the resulting magnetic ground states. Consequently, the magnetic ordering can be tuned between antiferromagnetic and antiferromagnetic dimer phases. These phases are experimentally observed in chains fabricated using both conventional electron-beam lithography and ion implantation techniques, demonstrating the feasibility of controlling magnetic properties at the mesoscale. The ability of attaining these magnetic structures by thermal annealing, underlines the potential of using such systems instead of simulated annealers in tackling combinatorial optimization tasks.

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Phys. Rev. B 111, L020408– Published 16 January, 2025
  • Received 29 October 2024
  • Revised 13 December 2024
  • Accepted 16 December 2024
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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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