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Interaction modifiers in artificial spin ices

Interaction modifiers in artificial spin ices

Title: Interaction modifiers in artificial spin ices
Author: Östman, Erik
Stopfel, Henry
Chioar, Ioan-Augustin
Arnalds, Unnar B.
Stein, Aaron
Kapaklis, Vassilios
Hjörvarsson, Björgvin   orcid.org/0000-0003-1803-9467
Date: 2018-02-12
Language: English
Scope: 375-379
University/Institute: Háskóli Íslands
University of Iceland
School: Verkfræði- og náttúruvísindasvið (HÍ)
School of Engineering and Natural Sciences (UI)
Department: Raunvísindastofnun (HÍ)
Science Institute (UI)
Series: Nature Physics;14(4)
ISSN: 1745-2473
1745-2481 (eISSN)
DOI: 10.1038/s41567-017-0027-2
Subject: Magnetic properties and materials; Metamaterials; Statistical physics; Segulmagn; Segulsvið
URI: https://hdl.handle.net/20.500.11815/1483

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Östman, E., Stopfel, H., Chioar, I.-A., Arnalds, U. B., Stein, A., Kapaklis, V., & Hjörvarsson, B. (2018). Interaction modifiers in artificial spin ices. Nature Physics, 14(4), 375-379. doi:10.1038/s41567-017-0027-2


The modification of geometry and interactions in two-dimensional magnetic nanosystems has enabled a range of studies addressing the magnetic order1,2,3,4,5,6, collective low-energy dynamics7,8 and emergent magnetic properties5, 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 plane11. 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.


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