Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 14: Focus Session: Frustrated Magnetism and Local Order (joint session MA/TT)
MA 14.9: Hauptvortrag
Dienstag, 19. März 2024, 12:45–13:15, H 1058
New Frontiers in Artificial Spin Ice: Phase Transitions in Two and Three Dimensions — •Gavin M. Macauley1,2, Luca Berchialla1,2, Aleksandra Pac1,2, Tianyue Wang1,2, Armin Kleibert3, Valerio Scagnoli1,2, Peter M. Derlet4, and Laura J. Heyrderman1,2 — 1Laboratory for Mesoscopic Systems, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland — 2Laboratory for Multiscale Materials Experiments, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland — 3Swiss Light Source, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland — 4Condensed Matter Theory Group, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
Artificial spin ices are arrays of strongly correlated nanomagnets, which are coupled through the dipolar interaction. While originally envisaged as a two-dimensional analogue to frustrated rare-earth pyrochlores, they are now studied since they exhibit behaviour such as glassiness and charge fragmentation, and topologically induced textures such as magnetic ‘monopoles’ [1]. In this talk, I will introduce artificial spin ice and discuss some recent work performed in the Laboratory for Mesoscopic Systems. By way of example, I will discuss how they can be used as a platform to study phase transitions by focusing on the example of a rotated kagome-like lattice in two-dimensions and an artificial spin ice based on the buckyball in three-dimensions. These systems have complex phase diagrams, with crossovers, phase transitions, and phase coexistence. [1] Skjaervo, S.H., Marrows, C.H., Stamps, R.L. and Heyderman, L.J. Nat. Rev. Phys. 2, 13-28 (2020).
Keywords: artificial spin ice; kagome; phase transitions