To realize a sustainable society, 'green technology' with low (or even zero) CO2 emissions is required. A key material in such technology is a permanent magnet because it is utilized for electric-power conversion in several applications including electric vehicles (EVs), hybrid EVs (HEVs), and turbines for wind power generation. To realize highly efficient electric-power conversion, a stronger permanent magnet than Nd-Fe-B is necessary. One potential candidate is a Fe-rich SmFe12-based compound with a ThMn12 structure. In this paper, the phase stability, structure, and intrinsic and extrinsic magnetic properties in both film and bulk forms are reviewed. Based on these results, a possible way to realize a strong SmFe12-based permanent magnet in bulk form is discussed.
Keywords: 203 Magnetics / Spintronics / Superconductors; 40 Optical; Permanent magnet; Sm(Fe-Co)12; ThMn12; coercivity; magnetic and electronic device materials.
© 2021 The Author(s). Published by National Institute for Materials Science in partnership with Taylor & Francis Group.