Ultra-high coercivity of (Fe86−xNbxB14)0.88Tb0.12 bulk nanocrystalline magnets

[Display omitted] The paper refers to hard magnetic properties of (Fe86−xNbxB14)0.88Tb0.12 bulk nanocrystalline magnets prepared using the vacuum mold suction technique. A combination of a specific chemical composition and sample preparation technology leads to a formation of dendrite grains of Tb2F...

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Bibliographic Details
Published in:Acta materialia 2015-10, Vol.98, p.318-326
Main Authors: Chrobak, A., Ziółkowski, G., Randrianantoandro, N., Klimontko, J., Chrobak, D., Prusik, K., Rak, J.
Format: Article
Language:English
Subjects:
Alloys
Biphase magnetic systems
Coercive force
Coercivity
Dendritic structure
Hard magnets
Magnetic domains
Magnetic properties
Magnets
Micromagnetism
Nanocrystals
Niobium
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Summary:[Display omitted] The paper refers to hard magnetic properties of (Fe86−xNbxB14)0.88Tb0.12 bulk nanocrystalline magnets prepared using the vacuum mold suction technique. A combination of a specific chemical composition and sample preparation technology leads to a formation of dendrite grains of Tb2Fe14B hard magnetic phase. The microstructure of the obtained alloys strongly depends on both these factors. The examined alloys reveal high and ultra-high coercivity exceeding 7T at room temperature. It was shown that the observed magnetic hardening is caused by the shape of the dendrite grains with sub-micro branches as a source of additional exchange anisotropy. Favorable hard magnetic properties occur for the alloy with 6at.% of Nb content which corresponds to the maximum of activation enthalpy of Fe crystallization in amorphous Fe86−xNbxB14 basic alloys.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2015.07.056