Magnetic recording medium with a chromium alloy underlayer and a cobalt-based magnetic layer
AssigneeInternational Business Machines Corporation
InventorJames K. Howard
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Abstract
An improved cobalt-platinum (CoPt) thin film metal alloy media for horizontal magnetic recording has a squareness greater than prior CoPt thin film metal alloy media. An underlayer of a body-centered-cubic (BCC) chromium-based alloy with a lattice cell constant greater than chromium (Cr), such as chromium-vanadium (CrV), is formed between the substate and the CoPt magnetic layer. The underlayer also improves the magnetic properties of the media when the magnetic layer is an alloy of cobalt-platinum-chromium (CoPtCr).
Claims7
A magnetic recording medium for horizontal recording comprising:
- a substrate;
- a nonmagnetic layer formed on the substrate from an alloy of chromium and either vanadium or iron;
- and
- a magnetic layer of an alloy comprising cobalt and platinum formed on the nonmagnetic layer.
A magnetic recording medium for horizontal recording comprising:
- a substrate;
- a layer of chromium-vanadium alloy formed on the substrate;
- and
- a magnetic layer of an alloy comprising cobalt and platinum formed on the chromium-vanadium alloy layer, the magnetic layer comprising a mixed phase of HCP and FCC crystallites.
Dependencies are inferred from the claim text.