Magnetic and structural properties of La-substituted ferrites

Production methods for obtaining the metastable LaFe/sub 12/O/sub 19/ are described. The magnetic properties of La-substituted Sr hexaferrite and pure LaFe/sub 12/O/sub 19/ are summarized. The uniaxial anisotropy of LaFe/sub 12/O/sub 19/ increases dramatically with decreasing temperature. This is at...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2005-10, Vol.41 (10), p.3889-3891
Main Authors: Kupferling, M., Grossinger, R., Wiesinger, G., Pieper, M., Reissner, M.
Format: Article
Language:English
Subjects:
Anisotropic magnetoresistance
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Ferrites
Hexaferrites
Iron
Magnetic anisotropy
Magnetic properties
Magnetism
magnetocrystalline anisotropy
Materials science
Metastasis
MÖssbauer spectroscopy
Other topics in materials science
Perpendicular magnetic anisotropy
Physics
Production
Strontium
Temperature
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Description
Summary:Production methods for obtaining the metastable LaFe/sub 12/O/sub 19/ are described. The magnetic properties of La-substituted Sr hexaferrite and pure LaFe/sub 12/O/sub 19/ are summarized. The uniaxial anisotropy of LaFe/sub 12/O/sub 19/ increases dramatically with decreasing temperature. This is attributed to a change of the Fe/sup 3+/ to an Fe/sup 2+/ on the 2a site which is confirmed by Mo/spl uml/ssbauer spectroscopy. This leads to a semiconductor behavior visible in the temperature dependence of the electrical resistivity.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2005.854947