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  • Slöetjes, Sam D., et al. (author)
  • Effects of array shape and disk ellipticity in dipolar-coupled magnetic metamaterials
  • 2021
  • In: Physical Review B. - : American Physical Society. - 2469-9950 .- 2469-9969. ; 104:13
  • Journal article (peer-reviewed)abstract
    • Two-dimensional lattices of dipolar-coupled thin film ferromagnetic nanodisks give rise to emergent superferromagnetic (SFM) order when the spacing between dots becomes sufficiently small. In this paper, we define micron-sized arrays of permalloy nanodisks arranged on a hexagonal lattice. The arrays were shaped as hexagons, squares, and rectangles to investigate finite-size effects in the SFM domain structure for such arrays. The resulting domain patterns were examined using x-ray magnetic circular dichroism photoemission electron microscopy. At room temperature, we find these SFM metamaterials to be below their blocking temperature. Distinct differences were found in the magnetic switching characteristics of horizontally and vertically oriented rectangular arrays. The results are corroborated by micromagnetic simulations.
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