Different origin of the perpendicular anisotropy in amorphous Gd-Fe from Gd-Co films

Abstract

In order to contribute to the investigations of the mechanism of positive K <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">u</inf> induced in the amorphous R-T films, a magnetic study was made on the amorphous Gd-Fe and Gd-Co films prepared under various conditions. It is found that the origin of K <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">u</inf> in the Gd-Fe films is quite different from that in the Gd-Co ones. In the case of Gd-Co, the positive K <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">u</inf> is known to be induced by a resputtering effect and its physical origin is thought as an atomic pair ordering. However, a different mechanism of stress induced anisotropy is taken as the responsible one for the positive K <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">u</inf> in the Gd-Fe films.