Epitaxial rare-earth-transition-metal thin films have been grown by ma
gnetron sputtering onto buffered single-crystal MgO substrates. Result
s are presented for SmFe12(001) and magnetically hard Sm2Co7 and Sm2Co
17 (110) films using W (100) buffer layers, The methodology of utilizi
ng epitaxial W buffer layers combined with cosputtering from elemental
sources provides a general approach to tailor the orientation and pha
se of the films. (C) 1997 American Institute of Physics.