Process of making a magnetic recording medium
AssigneeBASF SE
InventorsEckhart Kneller, Roland Koenig, Eberhard Koester, Werner Grau, Dieter Mayer
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Abstract
A magnetic recording medium comprising a non-magnetic base which is dimensionally stable at up to 300.degree. C., and an 0.03-0.4 .mu.m thick magnetically hard recording layer of an Sm-Co alloy, vacuum-deposited thereon, which layer possesses uniaxial magnetic anisotropy in the plane of the layer, and a process for the manufacture of this recording medium.
Claims6
A process for the manufacture of a magnetic recording medium by vacuum-depositing a recording layer of an Sm-Co alloy onto a non-magnetic base which is dimensionally stable at up to 300.degree. C., wherein the recording layer consists of an amorphous Sm-Co.sub.x alloy, where x is from 1 to 20, possesses uniaxial magnetic anisotropy in the plane of the layer and has a coercive force of from 10 to 100 kA/m and a squareness ratio of more than 0.9, and the surface of the base is provided, parallel to the intended uniaxial anisotropy, with groove-shaped depressions having a depth of from 0.03 to 0.4 .mu.m, at a spacing of from 10 to 200 .mu.m.
Dependencies are inferred from the claim text.