Patents by Inventor Greg S. Mowry

Greg S. Mowry 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).

  • Patent number: 5776537
    Abstract: An MR sensor includes an MR layer and permanent magnets defining an active area on the MR layer. A bi-layer test structure is fabricated with a permanent magnet layer deposited on a substrate and an MR layer deposited on the permanent magnet layer. If desired, a SAL may be deposited prior to deposition of the permanent magnet layer. A DC magnetic field is applied to the bi-layer test structure, and the strength of the DC magnetic field is varied. During application of the DC magnetic field, the magnetic response of the bi-layer test structure is measured to determine a hysteresis loop of the bi-layer structure. The exchange coupling between the permanent magnet layer and the MR layer is characterized by a point of inflection identified on the measured hysteresis loop.
    Type: Grant
    Filed: February 5, 1997
    Date of Patent: July 7, 1998
    Assignee: Seagate Technology, Inc.
    Inventors: Patrick J. Ryan, Zhijun Yang, Greg S. Mowry
  • Patent number: 5264980
    Abstract: A method of establishing a single domain in a magnetoresistive sensor positioned in a gap between two shield layers of magnetic material. The method includes the steps of heating the magnetoresistive head above the Neel temperature of at least one of the shield layers of magnetic material. Applying an external magnetic field to the magnetoresistive sensor and the shield layers for establishing a single magnetic domain in the magnetoresistive sensor. Reducing the intensity of the external magnetic field for holding the magnetization of the magnetoresistive sensor during cooling. Cooling the magnetoresistive head.
    Type: Grant
    Filed: August 2, 1989
    Date of Patent: November 23, 1993
    Assignee: Seagate Technology, Inc.
    Inventors: Greg S. Mowry, Terry B. Mitchell
  • Patent number: 4967298
    Abstract: An elongated magnetoresistive sensor strip longitudinally biased to maintain a single domain sense region by exchange-biasing material atomically coupled to the strip at the ends of the strip outside of a central sense region. The magnetoresistive sense strip is included in a magnetic head which has a leading pole, a trailing pole, and a shield. A first gap is located between the leading pole and the trailing pole and a second gap is located between the trailing pole and the shield with the sense strip located in the second gap.
    Type: Grant
    Filed: September 29, 1989
    Date of Patent: October 30, 1990
    Inventor: Greg S. Mowry
  • Patent number: 4891725
    Abstract: An elongated magnetoresistive sensor strip longitudinally biased to maintain a single domain sense region by exchange-biasing material atomically coupled to the strip at the ends of the strip outside of a central sense region.
    Type: Grant
    Filed: July 19, 1988
    Date of Patent: January 2, 1990
    Assignee: Magnetic Peripherals Inc.
    Inventor: Greg S. Mowry
  • Patent number: 4841398
    Abstract: A non linear magnetoresistive sensor having a magnetoresistive strip with no transverse biasing (either permanent or current) such that the sensor is operated in its non linear mode. The sensor is useful in its non linear mode to determine the location of pulse peaks from encoded data from a medium by differentiating and determining the zero crossings of the detected signal.
    Type: Grant
    Filed: February 17, 1987
    Date of Patent: June 20, 1989
    Assignee: Magnetic Peripherals Inc.
    Inventor: Greg S. Mowry
  • Patent number: 4803580
    Abstract: A magnetoresistive head having separate write and read gaps including a leading write pole, a trailing write/shield pole, and a following shield pole, wherein an elongated magnetoresistive sensor strip having a central sense region is mounted in the read gap, and further wherein the leading write pole has a length corresponding to the central sense region of the sensor and defines a track width, and the trailing/shield pole and following shield are the same length as the overall length of the magnetoresistive sensor strip.
    Type: Grant
    Filed: February 17, 1987
    Date of Patent: February 7, 1989
    Assignee: Magnetic Peripherals Inc.
    Inventor: Greg S. Mowry