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Interaction modifiers in artificial spin ices
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.
Univ Iceland, Sci Inst, Reykjavik, Iceland.
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2018 (English)In: Nature Physics, ISSN 1745-2473, E-ISSN 1745-2481, Vol. 14, no 4, p. 375-379Article in journal (Refereed) Published
Abstract [en]

The modification of geometry and interactions in two-dimensional magnetic nanosystems has enabled a range of studies addressing the magnetic order(1-6), collective low-energy dynamics(7,8) and emergent magnetic properties(5,9,10) in, for example, artificial spin-ice structures. The common denominator of all these investigations is the use of Ising-like mesospins as building blocks, in the form of elongated magnetic islands. Here, we introduce a new approach: single interaction modifiers, using slave mesospins in the form of discs, within which the mesospin is free to rotate in the disc plane(11). We show that by placing these on the vertices of square artificial spin-ice arrays and varying their diameter, it is possible to tailor the strength and the ratio of the interaction energies. We demonstrate the existence of degenerate ice-rule-obeying states in square artificial spin-ice structures, enabling the exploration of thermal dynamics in a spin-liquid manifold. Furthermore, we even observe the emergence of flux lattices on larger length scales, when the energy landscape of the vertices is reversed. The work highlights the potential of a design strategy for two-dimensional magnetic nano-architectures, through which mixed dimensionality of mesospins can be used to promote thermally emergent mesoscale magnetic states.

Place, publisher, year, edition, pages
NATURE PUBLISHING GROUP , 2018. Vol. 14, no 4, p. 375-379
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-352710DOI: 10.1038/s41567-017-0027-2ISI: 000429434100018OAI: oai:DiVA.org:uu-352710DiVA, id: diva2:1214961
Funder
Knut and Alice Wallenberg Foundation, 2015.0060Swedish Research CouncilEU, Horizon 2020, 737093Available from: 2018-06-07 Created: 2018-06-07 Last updated: 2018-06-07Bibliographically approved

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Östman, ErikStopfel, HenryChioar, Ioan-AugustinKapaklis, VassiliosHjörvarsson, Björgvin

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