鉄基アモルファス薄帯の垂直磁気異方性

概要

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A study is made with respect to an origin of the unusual magnetic anisotropy induced perpendicularly to the ribbon surface in Fe-Ni amorphous ribbons containing phosphorus by non-field annealing in H2 or N2 atmosphere. This anisotropy has a considerable dependence on iron content similar to the induced anisotropy observed in the case of field annealing. A formation of oxidizing layer of a 4000Å thickness is confirmed on the surface of ribbons in which the unusual anisotropy is induced. On the basis of domain model, it is shown that the layer is too thin to produce the stress-induced anisotropy for ribbons about 40μm thick. The iron-content dependence of Ku, which is a temperature invariant expression of the magnetic anisotropy constant indicates that the main cause of the perpendicular anisotropy is atomic directional ordering formed during process of the uniaxial diffusion of the iron atoms.
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