Patents by Inventor Chiuming Leung

Chiuming Leung 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).

  • Magnetoresistive sensor with funnel-shaped free layer, magnetic head, head gimbal assembly, and disk drive unit with the same
    Patent number: 8767356
    Abstract: An MR sensor includes a first shielding layer, a second shielding layer, an MR element formed therebetween, and a pair of hard magnet layers respectively placed on two sides of the MR element. The MR element includes an AFM layer formed on the first shielding layer, a pinned layer formed on the AFM layer and a free layer formed between the pinned layer and the second shielding layer. The free layer is funnel-shaped, which has a first edge facing an air bearing surface and a second edge opposite the first edge, and the first edge has a narrower width than that of the second edge. The MR sensor can improve MR height control performance, and improve the ESD performance and decrease the PCN and RTN and, in turn, get a more stable performance. The present invention also discloses a magnetic head, an HGA and a disk drive unit.
    Type: Grant
    Filed: June 11, 2010
    Date of Patent: July 1, 2014
    Assignees: SAE Magnetics (H.K.) Ltd., TDK Corporation
    Inventors: Chiuming Leung, Kosuke Tanaka, Kazuki Sato, Cheukwing Leung, Juren Ding, Rongkwang Ni, Wanyin Kwan, Mankit Lee
  • Magnetoresistive sensor, magnetic head, head gimbal assembly, and disk drive unit with the same
    Publication number: 20110235214
    Abstract: A MR sensor includes a first shielding layer, a second shielding layer, a MR element formed therebetween, and a pair of hard magnet layers respectively placed on two sides of the MR element. The MR element comprises an AFM layer formed on the first shielding layer, a pinned layer formed on the AFM layer and a free layer formed between the pinned layer and the second shielding layer. The free layer is funnel-shaped, which having a first edge facing the air bearing surface and a second edge opposite the first edge, and the first edge has a narrower width than that of the second edge. The structure of the MR sensor can improve MR height control performance, and improve the ESD performance and decrease the PCN and RTN and, in turn, get a more stable performance. The present invention also discloses a magnetic head, a HGA and a disk drive unit.
    Type: Application
    Filed: June 11, 2010
    Publication date: September 29, 2011
    Applicants: SAE Magnetics (H.K.) Ltd., TDK Corporation
    Inventors: Chiuming Leung, Kosuke Tanaka, Kazuki Sato, Cheukwing Leung, Juren Ding, Rongkwang Ni, Wanyin Kwan, Mankit Lee