In order to better study the electromagnetic properties of superconducting films, the perpendicular critical-state ac susceptibility χ=χ′−jχ″ of a square superconducting film is numerically calculated using a magnetic energy minimization procedure as a function of the field amplitude Hm. The emphasis is put on the calculation accuracy of the low-Hm limit χ0 and the Hm at χ″=χm″. It is shown that after having accurate χ0, χ(Hm) of the square film can be accurately scaled from the analytical χ(Hm) of a thin disk.
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Chen et al. (2008) studied this question.
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