Patents by Inventor Sigrid R. Herd

Sigrid R. Herd has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Zero to low magnetostriction, high coercivity, polycrystalline, Co-Pt magnetic recording media
    Patent number: 4438066
    Abstract: An alloy of Co.sub.x Pt.sub.y with y between 10 and 30 at. % is made by sputtering with H.sub.c >500 Oe and 4.pi.M.sub.s >5000 gauss, and zero magnetostriction. For 10 to 30 at. % Co the sputtered alloy has an H.sub.c of 500-1000 Oe with 4.pi.M.sub.s of 4000-14000 gauss, a magnetostriction passing through zero between 20 and 30 at. % of Pt. For thickness below 1000.ANG. H.sub.c is large (for the above range of alloys) and magnetization is also larger and coercivity varies as a direct function of Pt composition in the alloy up to 30 at. %.
    Type: Grant
    Filed: June 30, 1981
    Date of Patent: March 20, 1984
    Assignee: International Business Machines Corporation
    Inventors: Joseph A. Aboaf, Erik Klokholm, Sigrid R. Herd