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We studied the second derivative of the magnetization with respect to the magnetic field, d^{2M}d{H^2}, for polycrystalline materials having uniaxial anisotropy. Evidence is given of a singular point located at H=H₀, the anisotropy field. The observed sharp peak is associated with the infinity at H=H₀ of the d^{2M}d{H^2} curve for the single crystal in the hard direction. The detection of singularities is proposed as a new, and sometimes unique, method of measuring magnetic anisotropy using polycrystalline samples.
Asti et al. (Mon,) studied this question.