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Magnetic and structural properties of La-substituted ferrites

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5 Author(s)
Kupferling, M. ; Dept. of Solid State Phys., Vienna Univ. of Technol., Austria ; Grossinger, R. ; Wiesinger, G. ; Pieper, M.
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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.

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Magnetics, IEEE Transactions on  (Volume:41 ,  Issue: 10 )