Magnetic properties of a new family of rare-earth substituted ferrites

The magnetic properties of substituted hard-magnetic M-type ferrites are surveyed. A combined La–Co substitution leads to magnets of compositions Ba 1− x La x Fe 12− x Co x O 19 and Sr 1− x La x Fe 12− x Co x O 19 ( x= 0, 0.1, 0.2, 0.3, 0.4). Due to this substitution, the anisotropy as well as the c...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2003-04, Vol.327 (2), p.202-207
Main Authors: Grössinger, R., Tellez Blanco, C., Küpferling, M., Müller, M., Wiesinger, G.
Format: Article
Language:English
Subjects:
Anisotropy
Coercivity
Substituted ferrites
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Summary:The magnetic properties of substituted hard-magnetic M-type ferrites are surveyed. A combined La–Co substitution leads to magnets of compositions Ba 1− x La x Fe 12− x Co x O 19 and Sr 1− x La x Fe 12− x Co x O 19 ( x= 0, 0.1, 0.2, 0.3, 0.4). Due to this substitution, the anisotropy as well as the coercivity increases. The effect of the ion size was studied on the system (Sr 1− y Ca y ) 1− x La x Fe 12− x Co 0.75 x Fe 2+ 0.25 x O 19 ( x= 0.2, 0.4; y= 0, 0.33, 0.66, 1). Additionally, Sm substitution which leads to a strong increase of the coercivity was studied, but the effect on the anisotropy is small (1%).
ISSN:0921-4526
1873-2135
DOI:10.1016/S0921-4526(02)01728-3