Quantifying ground state degeneracy in planar artificial spin ices: the magnetic structure factor approach

2023/10/14 by Fábio Santos do Nascimento, L. B. de Oliveira, Nascimento, F. S. +9
Physics and Astronomy · #Advanced Condensed Matter Physics #FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Quantum many-body systems #Theoretical and Computational Physics

paper · pdf · doi:10.48550/arxiv.2310.09662

openalex publication_date 2023/10/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Magnetic structure factor (MSF) is employed to investigate the ground state degeneracy in rectangular-like artificial spin ices. Our analysis considers the importance of nanoislands size via dumbbell model approximation. Pinch points in MSF and residual entropy are found for rectangular lattices with disconnected nanoislands, signalizing an emergent gauge field, through which magnetic monopoles interact effectively. Dipole-dipole interaction is also used and its predictions are compared with those obtained by dumbbell model.

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