Co/X/Gd/X人工格子(X=Cu, Ag, Au, Pt, Y,およびW)の間接交換結合と磁化過程 (<特集>多層膜・人工格子・グラニューラー)

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We investigated the indirect exchange coupling between Co and Gd across nonmagnetic interlayers in Co/X/Gd/X multilayers (X = Cu, Ag, Au, Pt, Y, dnd W). The spin-flop field, H_<sf>, decrease with increasing interlayer thickness, t_x, for all X. Howevet, the manner of the decrease depends strongly on X: For X = Cu, H_<sf> decreases owing to interdiffusion between Cu and Gd at the interfaces. For X = Ag, Au, Pt, Y, and W, the decrease in H_<sf> is considered to be due to a decrease in the exchange coupling strength, J_<co-Gd>. For X = Ag, Au, Pt, and Y, J_<Co-Gd> decreases slowly with increasing t_x and remains even for t_x>__-10A; for X = W, on the other hand, it decreases repidly and disappears for t_x>__-5A. We consider that the difference is attributable to the electronic structure of X.
1997-04-15