Preparation and Magnetic Properties of MnBi-based Hard/Soft Composite Magnets

Journal Article · Wed May 07 00:00:00 EDT 2014 · Journal of Applied Physics, 115(17):Article No. 17A755

DOI:https://doi.org/10.1063/1.4868078· OSTI ID:1176837

Ma, Yilong; Liu, Xubo; Gandha, Kinjal; Vuong, Nguyen V.; Yang, Y. B.; Yang, Jinbo; Poudyal, Narayan; Cui, Jun; Liu, J. Ping

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 using 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 nanoparticles and 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.

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1176837
• Report Number(s): PNNL-SA-98447; CJ0100000
• Journal Information: Journal of Applied Physics, 115(17):Article No. 17A755, Journal Name: Journal of Applied Physics, 115(17):Article No. 17A755
• Country of Publication: United States
• Language: English

Related Subjects

MnBi
Magnet