Journal
NEW JOURNAL OF PHYSICS
Volume 22, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/ab6f91
Keywords
Hopfield model; brain-inspired computing; single atom magnetism; scanning probe microscopy; spin glass
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Funding
- NWO
- VIDI project: 'Manipulating the interplay between superconductivity and chiral magnetism at the single-atom level' [680-47-534]
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (SPINAPSE) [818399]
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We demonstrate that a two-dimensional finite and periodic array of Ising spins coupled via RKKY-like exchange can exhibit tunable magnetic states ranging across three distinct magnetic regimes: (1) a conventional ferromagnetic regime, (2) a glass-like regime, and (3) a new multi-well regime. These magnetic regimes can be tuned by one gate-like parameter, namely the ratio between the lattice constant and the oscillating interaction wavelength. We characterize the various magnetic regimes, quantifying the distribution of low energy states, aging relaxation dynamics, and scaling behavior. The glassy and multi-well behavior results from the competing character of the oscillating long-range exchange interactions with respect to the lattice. The multi-well structure features multiple attractors, each with a sizable basin of attraction. This may open the possible application of such atomic arrays as associative memories.
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