Mössbauer spectra and magnetic properties of mechanically alloyed SmFe11−xCoxTi

Abstract The effect of Co substitution on coercivity ( H C ) and 57 Fe hyperfine parameters of mechanically alloyed SmFe 11− x Co x Ti ( x ⩽2) were systematically studied. H C exhibits a maximum at 1123 K resulting from the competition between surface defect effect and domain size. It is shown from the isomer shift ( δ ) assigned on the basis of Wigner–Seitz cell volumes that Co atoms occupy preferentially 8f sites of the ThMn 12 -type structure. The mean hyperfine field ( B HF ) increases with substitution.