Preparation and magnetic properties of MnBi-based hard/soft composite magnets

Bulk anisotropic composite magnets based on MnBi/Co(Fe) exhibiting the different morphology of the soft magnetic phase were prepared by powder metallurgy processing. First, single-phase MnBi bulk magnets were produced with a maximum energy product [(BH)m] of 6.3 MGOe at room temperature. The nanosca...

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Bibliographic Details
Published inJournal of applied physics Vol. 115; no. 17
Main Authors Ma, Y. L., Liu, X. B., Gandha, K., Vuong, N. V., Yang, Y. B., Yang, J. B., Poudyal, N., Cui, J., Liu, J. P.
Format Journal Article
LanguageEnglish
Published Melville American Institute of Physics 07.05.2014
Subjects
Coercivity
Demagnetization
Magnetic properties
Magnetism
Magnets
Morphology
Nanowires
Powder metallurgy
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Summary:Bulk anisotropic composite magnets based on MnBi/Co(Fe) exhibiting the different morphology of the soft magnetic phase were prepared by powder metallurgy processing. First, single-phase MnBi bulk magnets were produced with a maximum energy product [(BH)m] of 6.3 MGOe at room temperature. The nanoscale soft phase with the different morphology was then added to form a composite magnet. It was observed that addition of magnetic soft-phase nanoflakes causes a dramatic coercivity reduction. However, the addition of soft magnetic phase nanowires enhanced the composite magnetization without sacrificing the coercivity. Nevertheless, a kink was still observed on the demagnetization curves and the coercivity decreased when the soft-phase content was larger than 10 wt. %, which was caused by the agglomeration of the soft phase nanowires that also led to a decreased degree of texture.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4868078