Journal
SCIENTIFIC REPORTS
Volume 4, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/srep04204
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Funding
- NSF [ECCS-0925626, DMR-1008791, ECCS-1232275]
- BaCaTec [A4 [2012-2]]
- Spanish MINECO [FIS2008-06249]
- CAM grant [S2009/MAT-1726]
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1232275] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1008791] Funding Source: National Science Foundation
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To develop a full understanding of interactions in nanomagnet arrays is a persistent challenge, critically impacting their technological acceptance. This paper reports the experimental, numerical and analytical investigation of interactions in arrays of Co nanoellipses using the first-order reversal curve (FORC) technique. A mean-field analysis has revealed the physical mechanisms giving rise to all of the observed features: a shift of the non-interacting FORC-ridge at the low-H-C end off the local coercivity H-C axis; a stretch of the FORC-ridge at the high-H-C end without shifting it off the H-C axis; and a formation of a tilted edge connected to the ridge at the low-H-C end. Changing from flat to Gaussian coercivity distribution produces a negative feature, bends the ridge, and broadens the edge. Finally, nearest neighbor interactions segment the FORC-ridge. These results demonstrate that the FORC approach provides a comprehensive framework to qualitatively and quantitatively decode interactions in nanomagnet arrays.
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