Atom-by-atom construction of attractors in a tunable finite size spin array
| Autor: | Mikhail I. Katsnelson, Hilbert J. Kappen, Alex Kolmus, Alexander A. Khajetoorians |
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| Rok vydání: | 2020 |
| Předmět: |
Spin glass
Theory of Condensed Matter Biophysics FOS: Physical sciences General Physics and Astronomy 01 natural sciences 010305 fluids & plasmas Lattice constant Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Atom Attractor 010306 general physics Spin (physics) Scaling Condensed Matter - Statistical Mechanics Physics Statistical Mechanics (cond-mat.stat-mech) Condensed matter physics Condensed Matter - Mesoscale and Nanoscale Physics Scanning Probe Microscopy Relaxation (NMR) Data Science Disordered Systems and Neural Networks (cond-mat.dis-nn) Condensed Matter - Disordered Systems and Neural Networks Ferromagnetism |
| Zdroj: | New Journal of Physics, 22, 2, pp. 1-8 New Journal of Physics, 22, 1-8 New Journal of Physics |
| ISSN: | 0305-4608 1402-4896 1367-2630 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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