TY - JOUR
T1 - High energy product of MnBi by field annealing and Sn alloying
AU - Zhang, Wenyong
AU - Balasubramanian, Balamurugan
AU - Kharel, Parashu
AU - Pahari, Rabindra
AU - Valloppilly, Shah R.
AU - Li, Xingzhong
AU - Yue, Lanping
AU - Skomski, Ralph
AU - Sellmyer, David J.
N1 - Funding Information:
This work was supported by the Department of Energy/Basic Energy Science (Grant No. DE-FG02-04ER46152) and performed in part in the Nebraska Nanoscale Facility: National Nanotechnology Coordinated Infrastructure and the Nebraska Center for Materials and Nanoscience, which are supported by the National Science Foundation (Grant No. NNCI-1542182) and the Nebraska Research Initiative.
Publisher Copyright:
© 2019 Author(s).
PY - 2019/12/1
Y1 - 2019/12/1
N2 - 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.
AB - 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.
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U2 - 10.1063/1.5128659
DO - 10.1063/1.5128659
M3 - Article
AN - SCOPUS:85077331289
SN - 2166-532X
VL - 7
JO - APL Materials
JF - APL Materials
IS - 12
M1 - 121111
ER -