Approaching the Topological Low-Energy Physics of the F Model in a Two-Dimensional Magnetic Lattice

0559444 - ÚPT 2023 RIV US eng J - Článek v odborném periodiku
Schánilec, V. - Brunn, Ondřej - Horáček, Miroslav - Krátký, Stanislav - Meluzín, Petr - Šikola, T. - Canals, B. - Rougemaille, N.
Approaching the Topological Low-Energy Physics of the F Model in a Two-Dimensional Magnetic Lattice.
Physical Review Letters. Roč. 129, č. 2 (2022), č. článku 027202. ISSN 0031-9007. E-ISSN 1079-7114
Výzkumná infrastruktura: CzechNanoLab - 90110
Institucionální podpora: RVO:68081731
Klíčová slova: F-model * artificial spin ice * micromagnetism
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 8.6, rok: 2022
Způsob publikování: Omezený přístup
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.129.027202

We demonstrate that the physics of the F model can be approached very closely in a two-dimensional artificial magnetic system. Faraday lines spanning across the lattice and carrying a net polarization, together with chiral Faraday loops characterized by a zero magnetic susceptibility, are imaged in real space using magnetic force microscopy. Our measurements reveal the proliferation of Faraday lines and Faraday loops as the system is brought from low- to high-energy magnetic configurations. They also reveal a link between the Faraday loop density and icelike spin-spin correlations in the magnetic structure factor. Key for this Letter, the density of topological defects remains small, on the order of 1% or less, and negligible compared to the density of Faraday loops. This is made possible by replacing the spin degree of freedom used in conventional lattices of interacting nanomagnets by a micromagnetic knob, which can be finely tuned to adjust the vertex energy directly, rather than modifying the two-body interactions.
Trvalý link: https://hdl.handle.net/11104/0333413