Patents by Inventor Daniel Andrew Nepela

Daniel Andrew Nepela 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).

  • Antiferromagnetic-ferromagnetic exchange bias films
    Patent number: 4103315
    Abstract: In thin film magnetic transducers, e.g., inductive or magnetoresistive recording heads, at least a pair of layers of a ferromagnetic material and an antiferromagnetic material are deposited upon one another and exchange coupled to retain a unidirectional bias in the plane of the ferromagnetic material. When multiple pairs of layers are used, they are separated by layers of nonmagnetic material. In some cases, successive pairs of layers of material with unidirectional bias have their directions of bias pointing in opposite directions. The domain walls in the layers of material are minimized by this technique.
    Type: Grant
    Filed: June 24, 1977
    Date of Patent: July 25, 1978
    Assignee: International Business Machines Corporation
    Inventors: Robert Douglas Hempstead, Sol Krongelb, Daniel Andrew Nepela, David Allen Thompson, Erich Philipp Valstyn
  • Ferromagnetic palladium alloys
    Patent number: 4098605
    Abstract: Ferromagnetic alloys containing palladium suitable for use in magnetic devices and having improved resistance to corrosion contain from about 20 to 65 atomic percent palladium, up to 80 atomic percent iron and 0 to 55 atomic percent nickel. Magnetic films made of these alloys which contain 20 to 65 atomic percent palladium exhibit a magnetization, 4.pi.M, and a corrosion resistance equal to or better than Permalloy.
    Type: Grant
    Filed: November 18, 1976
    Date of Patent: July 4, 1978
    Assignee: International Business Machines Corporation
    Inventors: Daniel Andrew Nepela, Donald Winston Rice, James Carr Suits