Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session A68: Artificial Spin Ice – The Next Generation
8:00 AM–11:00 AM,
Monday, March 6, 2023
Room: Room 420
Sponsoring
Unit:
GMAG
Chair: Cristiano Nisoli, Los Alamos Natl Lab
Abstract: A68.00005 : Local modifications for tuneable artificial spin ice*
10:24 AM–11:00 AM
Presenter:
Robb Puttock
(National Physical Laboratory, UK)
Author:
Robb Puttock
(National Physical Laboratory, UK)
Defects can have bountiful effects on the local physical properties of crystal systems and may be used to tune their properties. In this talk, novel ASI systems are presented that have been designed to influence the collective dynamic behavior of the macrospins in the array by introducing local modifications to the lattice. The first system introduces the quasi-hexagonal ASI lattice, which exhibits an induced shape anisotropy from introducing parallel islands along one symmetry axis. This enables multimodal frustration in the lattice across different sites as well as symmetry breaking during the breakdown of macrospins at high magnetic fields. The second system presented is a Kagome lattice with a magnetic defect, which acts as a source of emergent monopoles at lower energy-barriers than in the pristine lattice. Recent results of the delicate interplay between defect and lattice states are studied in the context of signal propagation applications by magnetic imaging techniques and micromagnetic modelling. This system shows that it is possible to manipulate the defect-induced monopoles whilst minimizing parasitic nucleation events in the lattice bulk. The outlook and directions for locally modified ASI devices will be reviewed in the wider landscape of ASI applications.
*This work was supported by the UK government department for Business, Energy, and Industrial Strategy through NMS funding (Low Loss Electronics) and the UK national Quantum Technologies programme. This work was also supported by the European Union's Horizon 2020 research and innovation programme under Grant agreement no. 823717—ESTEEM3.
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