Patents by Inventor Chu Sy Tran

Chu Sy Tran 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).

  • Patterned perpendicular magnetic recording medium with ultrathin noble metal interlayer
    Patent number: 9183865
    Abstract: A bit-patterned media (BPM) magnetic recording disk has a cobalt (Co) alloy recording layer (RL), a ruthenium (Ru) containing underlayer (UL), and a noble metal film (NMF) as an interlayer between the RL and the UL. The RL is preferably oxide-free and is a Co alloy, like a CoPtCr alloy, with a hexagonal-close-packed (hcp) crystalline structure with its c-axis oriented substantially perpendicular to the plane of the RL. The NMF is an element from the Pt group (Pt, Pd, Rh, Ir) and Au, or an alloy of two or more of these elements, and has a thickness less than 3.0 nm, preferably between 0.3 and 1.0 nm. The NMF does not interrupt the epitaxial growth of the RL and has little to no effect on the distribution of the RL c-axis orientation. The NMF increases the coercivity (Hc) and perpendicular magnetic anisotropy constant (Ku) of the RL.
    Type: Grant
    Filed: April 17, 2014
    Date of Patent: November 10, 2015
    Assignee: HGST Netherlands B.V.
    Inventors: Jean-Marc L. Beaujour, Bruce Alvin Gurney, Chu Sy Tran, Dieter K. Weller
  • PATTERNED PERPENDICULAR MAGNETIC RECORDING MEDIUM WITH ULTRATHIN NOBLE METAL INTERLAYER
    Publication number: 20150302878
    Abstract: A bit-patterned media (BPM) magnetic recording disk has a cobalt (Co) alloy recording layer (RL), a ruthenium (Ru) containing underlayer (UL), and a noble metal film (NMF) as an interlayer between the RL and the UL. The RL is preferably oxide-free and is a Co alloy, like a CoPtCr alloy, with a hexagonal-close-packed (hcp) crystalline structure with its c-axis oriented substantially perpendicular to the plane of the RL. The NMF is an element from the Pt group (Pt, Pd, Rh, Ir) and Au, or an alloy of two or more of these elements, and has a thickness less than 3.0 nm, preferably between 0.3 and 1.0 nm. The NMF does not interrupt the epitaxial growth of the RL and has little to no effect on the distribution of the RL c-axis orientation. The NMF increases the coercivity (Hc) and perpendicular magnetic anisotropy constant (Ku) of the RL.
    Type: Application
    Filed: April 17, 2014
    Publication date: October 22, 2015
    Applicant: HGST Netherlands B.V.
    Inventors: Jean-Marc L. Beaujour, Bruce Alvin Gurney, Chu Sy Tran, Dieter K. Weller
  • Perpendicular magnetic recording media with seed layer structure containing ruthenium (Ru)
    Publication number: 20130235490
    Abstract: An embodiment of the invention provides an apparatus that includes: a perpendicular magnetic recording medium including a substrate, a soft under layer above the substrate, a seed layer structure above the soft under layer, wherein the seed layer structure contains Ruthenium; and a magnetic recording layer above the seed layer structure.
    Type: Application
    Filed: March 9, 2012
    Publication date: September 12, 2013
    Inventors: Hoa Van Do, Kentaro Takano, Qi-Fan Xiao, Chu Sy Tran