Patents by Inventor Hyun-Sok Ko

Hyun-Sok Ko 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).

  • High density magnetic recording medium using FePtC thin film and manufacturing method thereof
    Patent number: 7241520
    Abstract: A high density magnetic recording medium which has coercivity suitable to a magnetic record, fine grains, and a uniform grain size distribution, and which includes a FePtC alloy thin film containing an optimum carbon content, and a method of manufacturing the high density magnetic recording medium. The magnetic recording medium includes the FePtC alloy thin film containing 25 volume % carbon, thus having microscopic magnetic and structural properties suitable to the high density magnetic recording medium.
    Type: Grant
    Filed: October 6, 2003
    Date of Patent: July 10, 2007
    Assignee: Korea Advanced Institue of Science & Technology
    Inventors: Sung-Chul Shin, Hyun-Sok Ko
  • High density magnetic recording medium using FePtC thin film and manufacturing method thereof
    Publication number: 20060051622
    Abstract: Disclosed is a high density magnetic recording medium which has coercivity suitable to a magnetic record, fine grains, and a uniform grain size distribution, and which includes a FePtC alloy thin film containing an optimum carbon content, and a method of manufacturing the high density magnetic recording medium. The magnetic recording medium includes the FePtC alloy thin film containing 25 volume % carbon, thus having microscopic magnetic and structural properties suitable to the high density magnetic recording medium. Additionally, the method of manufacturing the magnetic recording medium is characterized in that the method includes depositing the FePtC alloy thin film on a substrate at 400° C. using a dc magnetron sputtering device through a simultaneous deposition process, the FePtC alloy thin film is deposited on the substrate for one hour, and the substrate is heat-treated for one hour.
    Type: Application
    Filed: October 21, 2005
    Publication date: March 9, 2006
    Inventors: Sung-Chul Shin, Hyun-Sok Ko
  • High density magnetic recording medium using FePtC thin film and manufacturing method thereof
    Publication number: 20040110035
    Abstract: Disclosed is a high density magnetic recording medium which has coercivity suitable to a magnetic record, fine grains, and a uniform grain size distribution, and which includes a FePtC alloy thin film containing an optimum carbon content, and a method of manufacturing the high density magnetic recording medium. The magnetic recording medium includes the FePtC alloy thin film containing 25 volume % carbon, thus having microscopic magnetic and structural properties suitable to the high density magnetic recording medium. Additionally, the method of manufacturing the magnetic recording medium is characterized in that the method includes depositing the FePtC alloy thin film on a substrate at 400° C. using a dc magnetron sputtering device through a simultaneous deposition process, the FePtC alloy thin film is deposited on the substrate for one hour, and the substrate is heat-treated for one hour.
    Type: Application
    Filed: October 6, 2003
    Publication date: June 10, 2004
    Inventors: Sung-Chul Shin, Hyun-Sok Ko