Patents by Inventor William O'Kane

William O'Kane 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).

  • Publication number: 20050128637
    Abstract: A perpendicular writer of the present invention comprises a main pole connected to two return poles and further includes one or more shorting shields thereby reducing erasure field on double layer perpendicular media. The perpendicular writer may include side shorting shields connecting the first and second return poles thereby modifying the crosstrack field gradient. Additionally, the perpendicular writer may include a top shorting shield modifying the downtrack gradient and may additionally include a bottom shorting shield for further reduction of erasure fields. The distance between the main pole and the shorting shields may be modified to customize the write field gradient.
    Type: Application
    Filed: December 16, 2003
    Publication date: June 16, 2005
    Applicant: Seagate Technology LLC
    Inventors: Alan Johnston, Mark Gubbins, William O'Kane
  • Publication number: 20050128651
    Abstract: A spin polarization enhancement artificial (SPEA) magnet comprises combinations of positive spin asymmetry interfaces and inverse spin asymmetry interfaces arranged antiferromagnetically such that current passed through the SPEA magnet has enhanced spin polarization. The SPEA magnet additionally may combine bulk material properties of electron scattering to either supplement or replace the interfacial spin differentiation. A basic functional unit of the SPEA magnet includes two ferromagnetic layers separated by two spacer layers. Each spacer forms an interface such that adjacent ferromagnetic layers produce different spin symmetry. Antiferromagnetic arrangement of adjacent ferromagnetic layers coordinates the different spin symmetries such that a single spin state is selected and also provides additional stabilization to the SPEA magnet.
    Type: Application
    Filed: December 16, 2003
    Publication date: June 16, 2005
    Applicant: Seagate Technology LLC
    Inventors: Ge Yi, Robert Lamberton, Susan Murdoch, Thomas McLaughlin, William O'Kane
  • Publication number: 20050084668
    Abstract: The present invention includes magnetic write elements with portions formed a nanophase high magnetic moment material to enable further increases in areal density in magnetic recording. The nanophase deposited high magnetic moment material comprises coated nanoclusters and nanolaminated cluster films that are deposited to form nanophase high magnetic moment material portions of a write pole and SUL layer in perpendicular recording media. The nanophase write poles exhibit high magnetic moments and are generally compatible with conventional writer head fabrication techniques.
    Type: Application
    Filed: October 16, 2003
    Publication date: April 21, 2005
    Applicant: Seagate Technology LLC
    Inventors: Robert Lamberton, Declan Macken, Paul Dodd, William O'Kane
  • Publication number: 20040027732
    Abstract: A magnetic read head for use in a magnetic data storage and retrieval system is disclosed. The read head is typically a giant magnetoresistive (GMR) spin valve read sensor with a portion of the GMR spin valve read sensor implanted with ions. The implanted ions improve the GMR sensor's sensitivity to changes in resistance by increasing the resistance of inefficient or ineffective portions of the sensor. The invention is also directed to methods of making GMR read sensors.
    Type: Application
    Filed: October 17, 2002
    Publication date: February 12, 2004
    Inventors: Brian Kelly, Kevin John Duddy, Alan Johnston, William O'Kane