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M. Küpferling, R. Grössinger, G. Wiesinger, M. Pieper, M. Reissner:
"Magnetic and Structural Properties of La-Substituted Ferrites";
IEEE Transactions on Magnetics, Vol. 41 (2005), Nr. 10; S. 3889 - 3891.

Production methods for obtaining the metastable LaFe₁₂O₁₉ are described. The magnetic properties of La-substituted Sr hexaferrite and pure LaFe₁₂O₁₉ are summarized. The uniaxial anisotropy of LaFe₁₂O₁₉ increases dramatically with decreasing temperature. This is attributed to a change of the Fe³⁺ to an Fe²⁺ on the 2a site which is confirmed by Mössbauer spectroscopy. This leads to a semiconductor behavior visible in the temperature dependence of the electrical resistivity.

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC05938144

http://dx.doi.org/10.1109/TMAG.2005.854947