High energy product of MnBi by field annealing and Sn alloying

Zhang, Wenyong; Balasubramanian, Balamurugan; Kharel, Parashu; Pahari, Rabindra; Valloppilly, Shah R.; Li, Xingzhong; Yue, Lanping; Skomski, Ralph; Sellmyer, David J.

doi:10.1063/1.5128659

Title: High energy product of MnBi by field annealing and Sn alloying

Journal Article · 22 December 2019 · APL Materials

DOI: https://doi.org/10.1063/1.5128659 · OSTI ID:1800206

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Univ. of Nebraska, Lincoln, NE (United States). Nebraska Center for Materials and Nanoscience and Dept. of Physics and Astronomy; OSTI
Univ. of Nebraska, Lincoln, NE (United States). Nebraska Center for Materials and Nanoscience and Dept. of Physics and Astronomy
Univ. of Nebraska, Lincoln, NE (United States). Nebraska Center for Materials and Nanoscience; South Dakota State Univ., Brookings, SD (United States). Dept. of Physics
Univ. of Nebraska, Lincoln, NE (United States). Nebraska Center for Materials and Nanoscience
Nebraska Center for Materials and Nanoscience, Univ. of Nebraska, Lincoln, NE (United States). Nebraska Center for Materials and Nanoscience and Dept. of Physics and Astronomy

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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Research Organization:: Univ. of Nebraska, Lincoln, NE (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-04ER46152

OSTI ID:: 1800206

Journal Information:: APL Materials, Journal Name: APL Materials Journal Issue: 12 Vol. 7; ISSN 2166-532X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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