Ferromagnetic multilayer film with uniaxial magnetic anisotropy - has nickel-iron alloy layer and a second ferromagnetic layer contg. carbon or nitrogen on substrate

摘要

A ferromagnetic multi-layer film (I) with uniaxial magnetic anisotropy, high magnetic saturation induction (Bs) and low magnetostriction (lambda) comprises a thin layer of an NiFe-alloy and a second thin layer of a ferromagnetic material (II) on a substrate. (II) is predominantly made up of Fe with a predetermined amt. of an additive (III). The novelty is that (III) is carbon or nitrogen, present in an amt. of 0.01-1.5 wt. %. Prepn. of (I) is also claimed, in which the uniaxial magnetic anisotropy is impressed using a magnetic constant field (B). The first layer (5i) is an NiFe-alloy contg. 5-20, esp. 15.5 wt. Fe and is of thickness (d1) of 5-50nm. The second layer (6i) has a thickness (d2) and is of the same size as (d1). Ratio V of d2:d1 is V = 2-6. The multi-layer film is deposited on the substrate and the substrate contains TiC. USE - (I) are used in magnetic heads.