title: Quantitative decoding of interactions in tunable nanomagnet arrays using first order reversal curves.
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-HC end off the local coercivity HC axis; a stretch of the FORC-ridge at the high-HC end without shifting it off the HC axis; and a formation of a tilted edge connected to the ridge at the low-HC 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.
authors.affiliation: Dept. of Physics, University of California, Davis, California, 95616, USA.
authors.forename: Dustin A
authors.initials: DA
authors.lastname: Gilbert
authors.affiliation: Dept. of Physics, University of California, Davis, California, 95616, USA.
authors.forename: Gergely T
authors.initials: GT
authors.lastname: Zimanyi
authors.affiliation: Dept. of Physics, University of California, Davis, California, 95616, USA.
authors.forename: Randy K
authors.initials: RK
authors.lastname: Dumas
authors.affiliation: Dept. of Earth & Environmental Sciences, Ludwig-Maximilians-Universität München, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Winklhofer
authors.affiliation: Dept. Fisica Materiales, Universidad Complutense, 28040 Madrid, Spain.
authors.forename: Alicia
authors.initials: A
authors.lastname: Gomez
authors.affiliation: Dept. of Physics, University of California, Davis, California, 95616, USA.
authors.forename: Nasim
authors.initials: N
authors.lastname: Eibagi
authors.affiliation: 1] Dept. Fisica Materiales, Universidad Complutense, 28040 Madrid, Spain [2] IMDEA-Nanociencia, Cantoblanco 28049, Madrid, Spain.
authors.forename: J L
authors.initials: JL
authors.lastname: Vicent
authors.affiliation: Dept. of Physics, University of California, Davis, California, 95616, USA.
authors.forename: Kai
authors.initials: K
authors.lastname: Liu