Magnetic properties and microstructure of Sm5Fe17-based composite magnets.

I. Dirba, H. Sepehri-Amin, K. Skokov, Y. Skourski, K.Hono, O.Gutfleisch
Acta Mater. 212 (2021) 116912
DOI: j.actamat.2021.116912

We have achieved ultrahigh coercivities, 7.18 T at room temperature and 8.86 T at 10 K, in Sm5Fe17-based composite magnets. Detailed transmission electron microscopy investigations show a two-phase microstructure consisting of the Sm5Fe17-based hard magnetic matrix phase with grain size below 200 nm and finer, below 100 nm, Fe2Ti grains.

Many thanks to our collaborators from CMSM NIMS (Tsukuba, Japan) and HZDR (Dresden, Germany).