Atomic Structure Analysis of Amorphous Tb-Fe1-xCoxFilm Systems

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Abstract
The atomic structure of sputtered amorphous Tb-Fe1-xCoxthin film systems was studied by X-ray scattering. The composition fractionxwas varied systematically, and the basic atomic structures of Tb-Fe1-xCoxfilms were similar as a whole. The interatomic distances in Tb-Fe1-xCoxfilms annealed at 200°C, overall, tend to decrease when the Co content is increased. These distances seem to change discontinuously at a composition of aroundx=0.5. The coordination numbers of the corresponding atoms did not show much correlation with Co concentration except in the case of transition metal atoms around a transition metal atom. In this case, the coordination number increases after annealing, but this increment tends to decrease as the Co concentration increases in Tb-Fe1-xCoxfilms.