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 200 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 K 3 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. © 2003 Elsevier B.V. All rights reserved.
Magnetic anisotropy of LaCosubstituted SrFe12O19 ferrites / Asti, G.; Bolzoni, F.; Le Breton, J. M.; Ghidini, M.; Morel, A.; Solzi, M.; Kools, F.; Tenaud, P.. - In: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS. - ISSN 0304-8853. - 272-276:1(2004), pp. e1845-e1846. [10.1016/j.jmmm.2003.12.1275]