The magnetic anisotropy of LaCo-hexaferrites has been investigated by the use of the singular point detection and the second harmonic techniques in the low-temperature range. Below Full-size image (<1 K) a steep rise of the anisotropy field has been observed together with a strong distortion of the magnetization curve which is interpreted as due to a negative K2 and a large positive K3 anisotropy constants. The results are analyzed in terms of an extended Stoner–Wohlfarth model and the obtained values of the anisotropy coefficients χ2,0,χ4,0,χ6,0 are reported versus temperature.
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