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Gilbert, Dustin A.; Zimanyi, Gergely T.; Dumas, Randy K.; Winklhofer, Michael; Gomez, Alicia; Eibagi, Nasim; Vicent, J. L.; Liu, Kai (2014): Quantitative Decoding of Interactions in Tunable Nanomagnet Arrays Using First Order Reversal Curves. In: Scientific Reports, Vol. 4, 4204


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.