Phase stability and magnetic performance of nanocrystalline Sm-Co supersaturated solid solution

A new type of Sm-Co supersaturated solid solution has been developed with a stabilized TbCu7-type structure. The high-Co single phases were stabilized in a wide temperature range in the prepared SmCo9.8-x Si (x) (x=0-0.9) alloys by concurrent nanostructuring and Si-doping. The significant enhancement of the coercivity and remanence of the new type supersaturated solid solution are attributed to the effective pinning of the ultrafine nanograin boundaries and the high magnetocrystalline anisotropy of the solid solution. It was proposed that the high-temperature magnetic properties of the Sm-Co supersaturated solid solution depend strongly on the phase stability.