Intrinsic hard magnetic properties of Sm(Fe1 − xCox)12 compound with the ThMn12 structure.

We have grown Sm(Fe 1 − x Co x ) 12 ( x = 0, 0.1 and 0.2) films epitaxially on V(001) buffered MgO(001) single crystalline substrates in order to investigate the intrinsic hard magnetic properties of the Co substituted SmFe 12 phase with the ThMn 12 structure. We found Sm(Fe 0.8 Co 0.2 ) 12 has excellent intrinsic hard magnetic properties with spontaneous magnetization of 1.78 T, anisotropy field of 12 T and Curie temperature of 859 K, all of which are superior to those for Nd 2 Fe 14 B. Hence, the Sm(Fe 0.8 Co 0.2 ) 12 compound is promising as permanent magnet material, if it can be stabilized in a bulk form. [ABSTRACT FROM AUTHOR]