Magnetism in La substituted Sr hexaferrite

The electronic structure of La x Sr 1 − x Fe 12 O 19 ( x = 0 , 0.25, 0.5, 0.75, 1) hexaferrite is calculated using the density functional theory and generalized gradient approximation (GGA). The GGA + U method is used to improve the description of strongly correlated Fe 3 d electrons. Fe-sublattice...

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Bibliographic Details
Published in:Journal of applied physics 2005-05, Vol.97 (10), p.10F309-10F309-3
Main Authors: Küpferling, M., Novák, P., Knížek, K., Pieper, M. W., Grössinger, R., Wiesinger, G., Reissner, M.
Format: Article
Language:English
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Summary:The electronic structure of La x Sr 1 − x Fe 12 O 19 ( x = 0 , 0.25, 0.5, 0.75, 1) hexaferrite is calculated using the density functional theory and generalized gradient approximation (GGA). The GGA + U method is used to improve the description of strongly correlated Fe 3 d electrons. Fe-sublattice preferences for the magnetic moments introduced by La substitution were calculated. The results are compared with measurements of the magnetization performed in a vibrating sample magnetometer at 4.2 K, from which the magnetic moment per unit cell of La hexaferrite was derived. The calculations were started in order to find an explanation for the extraordinary behavior of the magnetocrystalline anisotropy of La containing M-type hexaferrites, which was confirmed by singular point detection measurements.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.1855710