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Realization of ground state in artificial kagome spin ice via topological defect-driven magnetic writing

Gartside, JC; Arroo, DM; Burn, DM; Bemmer, VL; Moskalenko, A; Cohen, LF; Branford, WR; (2018) Realization of ground state in artificial kagome spin ice via topological defect-driven magnetic writing. Nature Nanotechnology , 13 pp. 53-58. 10.1038/s41565-017-0002-1. Green open access

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Abstract

Arrays of non-interacting nanomagnets are widespread in data storage and processing. As current technologies approach fundamental limits on size and thermal stability, enhancing functionality through embracing the strong interactions present at high array densities becomes attractive. In this respect, artificial spin ices are geometrically frustrated magnetic metamaterials that offer vast untapped potential due to their unique microstate landscapes, with intriguing prospects in applications from reconfigurable logic to magnonic devices or hardware neural networks. However, progress in such systems is impeded by the inability to access more than a fraction of the total microstate space. Here, we demonstrate that topological defect-driven magnetic writing—a scanning probe technique—provides access to all of the possible microstates in artificial spin ices and related arrays of nanomagnets. We create previously elusive configurations such as the spin-crystal ground state of artificial kagome dipolar spin ices and high-energy, low-entropy ‘monopole-chain’ states that exhibit negative effective temperatures.

Type: Article
Title: Realization of ground state in artificial kagome spin ice via topological defect-driven magnetic writing
Location: England
Open access status: An open access version is available from UCL Discovery
DOI: 10.1038/s41565-017-0002-1
Publisher version: https://doi.org/10.1038/s41565-017-0002-1
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/10074642
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