Effects of magnetic monopoles charge on the cracking reversal processes in artificial square ices

In this paper we perform nanofabrication of square artificial spin ices with different lattice parameters, in order to investigate the roles of vertex excitation on the features of the system. In particular, the character of magnetic charge distribution asymmetry on the vertices are observed under m...

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Bibliographic Details
Published in:Scientific reports 2020-06, Vol.10 (1), p.9959-9959, Article 9959
Main Authors: de Paiva, T. S., Rodrigues, J. H., Mól, L. A. S., Pereira, A. R., Borme, J., Freitas, P. P., de Araujo, C. I. L.
Format: Article
Language:English
Subjects:
639/766/119/997
639/925/927/1062
Energy
Humanities and Social Sciences
multidisciplinary
Quantum field theory
Scanning electron microscopy
Science
Science (multidisciplinary)
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Summary:In this paper we perform nanofabrication of square artificial spin ices with different lattice parameters, in order to investigate the roles of vertex excitation on the features of the system. In particular, the character of magnetic charge distribution asymmetry on the vertices are observed under magnetic hysteresis loop experiments. We then compare our results with simulation using an emergent Hamiltonian containing objects such as magnetic monopoles and dipoles in the vertices of the array (instead of the usual Hamiltonian based on the dipolar interactions among the magnetic nanoislands). All possible interactions between these objects are considered (monopole-monopole, monopole-dipole and dipole-dipole). Using realistic parameters we observe very good match between experiments and theory, which allow us to better understand the system dynamics in function of monopole charge intensity.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-020-66794-0