レーザーアブレーションとスパッタリングを併用して作製したCo/Cu膜の構造と磁性

概要

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Co/Cu multilayers were prepared by a combination of laser ablation with rf sputtering. The layer structure was observed for Co and Cu layers of more than 4A thickness, where the films exhibit ferromagnetic behavior with low coercivity and high remance.In Co/Cu films with Co and Cu thicknesses of less than 2A, ferromagnetic M-H curves with high coercivity and anisotropic magnetoresistance were observed when the Co composition is more than 50%, while superparamagnetic M-H curves and no ovservable granular-type giant magnetoresistance were observed when the Co composition is less than 50%.The granular-type giant magnetoresistance was observed in Co/Cu films with a Co thickness of about 2Å and a Cu thickness of more than 4Å, which exhibit superparamagnetic behavior due to the discontinuous Co layers.Co/Cu films with Co and Cu thickness of 2.5Å showed a shifted hysteresis loop at low temperatures, in which a transient structure between a granular and layered structure was observed.
社団法人日本磁気学会の論文
1998-04-15