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High energy product of MnBi by field annealing and Sn alloying

Authors :
Wenyong Zhang
Balamurugan Balasubramanian
Parashu Kharel
Rabindra Pahari
Shah R. Valloppilly
Xingzhong Li
Lanping Yue
Ralph Skomski
David J. Sellmyer
Source :
APL Materials, Vol 7, Iss 12, Pp 121111-121111-4 (2019)
Publication Year :
2019
Publisher :
AIP Publishing LLC, 2019.

Abstract

Permanent-magnet materials are one cornerstone of today’s technology, abundant in disk drives, motors, medical equipment, wind generators, and cars. A continuing challenge has been to reconcile high permanent-magnet performance with low raw-material costs. This work reports a Mn-Bi-Sn alloy exclusively made from inexpensive elements, exhibiting high values of Curie-temperature, magnetization, anisotropy, coercivity, and energy product. The samples are produced by field annealing of rapidly quenched Sn-containing MnBi alloys, where the improvement of the magnetic properties is caused by the substitutional occupancy of the 2c sites in the hexagonal NiAs structure by Sn. The substitution modifies the electronic structure of the compound and enhances the magnetocrystalline anisotropy, thereby improving the coercivity of the compound. The energy product reaches 114 kJ/m3 (14.3 MGOe) at room temperature and 86 kJ/m3 (10.8 MGOe) at 200 °C; this value is similar to that of the Dy-free Nd2Fe14B and exceeds that of other rare-earth-free permanent-magnet bulk alloys, as encountered in automotive applications.

Details

Language :
English
ISSN :
2166532X
Volume :
7
Issue :
12
Database :
Directory of Open Access Journals
Journal :
APL Materials
Publication Type :
Academic Journal
Accession number :
edsdoj.fb7ef43433334929ba4a73559ec6d881
Document Type :
article
Full Text :
https://doi.org/10.1063/1.5128659