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A novel magneto-optical method has been used to probe the internal magnetic energy surface in 15015015nm^3 square Ni₈₀Fe₁₄Mo₅ (``supermalloy'') nanomagnets which were fabricated by electron beam lithography. A strong fourfold symmetric anisotropy field of strength 36520Oe is found, which confirms a recent prediction of the appearance of a configurational anisotropy due to the small deviations of the magnetization from the uniform state.
Cowburn et al. (1998) studied this question.