Magnetic order and energy-scale hierarchy in artificial spin-ice structures

Stopfel, Henry; Östman, Erik; Chioar, Ioan -Augustin; Greving, David; Arnalds, Unnar B.; Hase, Thomas P. A.; Stein, Aaron; Hjörvarsson, Björgvin; Kapaklis, Vassilios

doi:10.1103/PhysRevB.98.014435

Title: Magnetic order and energy-scale hierarchy in artificial spin-ice structures

Journal Article · Mon Jul 30 00:00:00 EDT 2018 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.98.014435· OSTI ID:1487251

Stopfel, Henry ^[1]; Östman, Erik ^[1]; Chioar, Ioan -Augustin ^[1]; Greving, David ^[2]; Arnalds, Unnar B. ^[3]; Hase, Thomas P. A. ^[2];

^[4]; Hjörvarsson, Björgvin ^[1]; Kapaklis, Vassilios ^[1]

Uppsala Univ., Uppsala (Sweden)
Univ. of Warwick, Coventry (United Kingdom)
Univ. of Iceland, Reykjavik (Iceland)
Brookhaven National Lab. (BNL), Upton, NY (United States)

In order to explain and predict the properties of many physical systems, it is essential to understand the interplay of different energy scales. Here we present investigations of the magnetic order in thermalized artificial spin-ice structures, with different activation energies of the interacting Ising-like elements. We image the thermally equilibrated magnetic states of the nanostructures using synchrotron-based magnetic microscopy. By comparing results obtained from structures with one or two different activation energies, we demonstrate a clear impact on the resulting magnetic order. The differences are obtained by the analysis of the magnetic spin structure factors, in which the role of the activation energies is manifested by distinct short-range order. Furthermore, these results highlight the potential of artificial spin-ice structures to serve as model systems for designing various energy-scale hierarchies and investigating their impact on the collective dynamics and magnetic order.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704; AC02-05CH11231

OSTI ID:: 1487251

Alternate ID(s):: OSTI ID: 1462142

Report Number(s):: BNL-209751-2018-JAAM; PRBMDO

Journal Information:: Physical Review B, Vol. 98, Issue 1; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Advances in artificial spin ice Skjærvø, Sandra H.; Marrows, Christopher H.; Stamps, Robert L. Nature Reviews Physics, Vol. 2, Issue 1 https://doi.org/10.1038/s42254-019-0118-3	journal	November 2019
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