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To develop a full understanding of interactions in nanomagnet arrays is apersistent challenge, critically impacting their technological acceptance. Thispaper reports the experimental, numerical and analytical investigation ofinteractions in arrays of Co nanoellipses using the first-order reversal curve(FORC) technique. A mean-field analysis has revealed the physical mechanismsgiving rise to all of the observed features: a shift of the non-interactingFORC-ridge at the low-H$_c$ end off the local coercivity H$_c$ axis; a stretchof 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 negativefeature, bends the ridge, and broadens the edge. Finally, nearest neighborinteractions segment the FORC-ridge. These results demonstrate that the FORCapproach provides a comprehensive framework to qualitatively and quantitativelydecode interactions in nanomagnet arrays.

Quantitative Decoding of Interactions in Tunable Nanomagnet Arrays Using First Order Reversal Curves