
Abstract
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.
Item Type: | Journal article |
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Faculties: | Geosciences > Department of Earth and Environmental Sciences |
Subjects: | 500 Science > 550 Earth sciences and geology |
URN: | urn:nbn:de:bvb:19-epub-33744-1 |
ISSN: | 2045-2322 |
Language: | English |
Item ID: | 33744 |
Date Deposited: | 15. Feb 2017, 14:45 |
Last Modified: | 04. Nov 2020, 13:11 |