Patents by Inventor Ian R. McFadyen

Ian R. McFadyen 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).

  • Data storage device reverse biasing head element to counter electro-migration
    Patent number: 10566018
    Abstract: A data storage device is disclosed comprising a first head actuated over a first disk surface, the first head comprising a plurality of elements including a first element. During a first write operation of the first head, a first bias signal having a first polarity is applied to the first element, and a write interval of the first write operation is measured. During a non-write mode of the first head, a second bias signal having a second polarity opposite the first polarity is applied to the first element during a reverse bias interval that is based on the write interval of the first write operation.
    Type: Grant
    Filed: March 21, 2019
    Date of Patent: February 18, 2020
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Joey M. Poss, Ian R. McFadyen, Jih-Shiuan Luo, Yunfei Ding
  • DATA STORAGE DEVICE REVERSE BIASING HEAD ELEMENT TO COUNTER ELECTRO-MIGRATION
    Publication number: 20190295580
    Abstract: A data storage device is disclosed comprising a first head actuated over a first disk surface, the first head comprising a plurality of elements including a first element. During a first write operation of the first head, a first bias signal having a first polarity is applied to the first element, and a write interval of the first write operation is measured. During a non-write mode of the first head, a second bias signal having a second polarity opposite the first polarity is applied to the first element during a reverse bias interval that is based on the write interval of the first write operation.
    Type: Application
    Filed: March 21, 2019
    Publication date: September 26, 2019
    Inventors: Joey M. POSS, Ian R. MCFADYEN, Jih-Shiuan LUO, Yunfei DING
  • Lapping method and station to achieve tight dimension controls for both read and write elements of magnetic recording heads and magnetic storage device formed thereby
    Patent number: 8390962
    Abstract: A station for performing a lapping method to achieve tight dimension controls for both read and write elements of magnetic recording heads is disclosed. A recording head having a read head stripe height and a write head throat height is lapped using a plurality of lapping forces. At least one of the plurality of lapping forces includes a torque force. A lapping wedge angle is controlled using at least one torque force, which controls the offset between the recording head read head stripe height and the write head throat height.
    Type: Grant
    Filed: September 29, 2005
    Date of Patent: March 5, 2013
    Assignee: HGST Netherlands B.V.
    Inventors: Jeffrey P. Gunder, Ian R. McFadyen, Darrick T. Smith, Scott A. Thomas, Xiao Z. Wu
  • Stress relief for electroplated films
    Patent number: 7459198
    Abstract: An electroplated film is deposited over a substrate with a plating frame pattern that includes a plating field defined by a plurality of individual features. By dividing the plating field into a plurality of individual features, the delamination force at any location on the plating field is greatly reduced. Thus, a film with a large stress, such as a high moment film, may be plated to a greater thickness than is possible with conventionally plated films.
    Type: Grant
    Filed: May 28, 2004
    Date of Patent: December 2, 2008
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Christian R. Bonhote, Heather K. DeSimone, John W. Lam, Matthew W. Last, Edward Hin Pong Lee, Ian R. McFadyen