CoCrPtB alloys with increased boron content and method of producing same

USRE38474E1 · kind E1 · reissue

Assignee

• Hitachi Global Storage Technologies Netherlands B.V. · NL

Inventors

• David Margulies · Gilroy, US
• Ernesto E. Marinero · Saratoga, US
• Hal J. Rosen · Los Gatos, US
• Brian R. York · San Jose, US
• Kurt Alan Rubin · Santa Clara, US

Key dates

• Filing date: Aug 27, 2002
• Grant date: Mar 23, 2004
• Expiry date: Aug 27, 2022

Classification

• Technology area (CPC —): General

Abstract

A magnetic layer structure with a layer of cobalt-chromium-platinum-boron composite alloy containing 10% to 20% B in the magnetic layer. The useful magnetic properties of the magnetic layer structure are achieved by the incorporation of a nucleation layer prior to the deposition of the magnetic layer. The resultant magnetic layer structures have coercivity Hc values in between 2,000 and 5,000 Oe, grain sizes between 30 and 200 Angstroms and anisotropic crystallographic orientation with the c-axis of the cobalt-chromium-platinum-boron in the plane of the medium. These magnetic layer structures are suitable for magnetic data storage devices including magnetic disks.