Ordered and disordered skyrmion states on a square substrate J. C. Bellizotti Souza, C. J. O. Reichhardt, C. Reichhardt, N. P. Vizarim and P. A. Venegas Eur. Phys. J. B, 98 7 (2025) 159 Published online: 29 July 2025 DOI: 10.1140/epjb/s10051-025-01010-4