Patents by Inventor Dean Walter Markuson

Dean Walter Markuson 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).

  • Spin valve head using high-coercivity hard bias layer
    Publication number: 20020015268
    Abstract: A magnetic sensor and method for making the sensor are disclosed. The sensor includes a giant-magnetoresistive sensing layer having a ferromagnetic free layer and a hard bias layer to maintain the free layer in a single-domain state or to stabilize the free layer. The hard bias layer has a coercivity of at least 2,000 Oe and a magnetic remnance times thickness at least twice the value of the saturation magnetization times thickness of the free layer. The hard bias layer includes a permanent magnetic layer formed on top of a seed layer made of the alloy TiW or other similar alloys. The seed layer may also be a bi-layer having a layer of TiW or ther similar alloys and a layer of soft magnetic material, with the former in contact with the permanent magnetic layer.
    Type: Application
    Filed: March 23, 2001
    Publication date: February 7, 2002
    Inventors: Sining Mao, Zheng Gao, Ananth Naman, Dean Walter Markuson, Paul Edward Anderson, Lujun Chen, Song Xue