Exchange-coupling Magnetization Layer Patents (Class 369/13.49)
  • Energy assisted magnetic recording medium capable of suppressing high DC readback noise
    Patent number: 9001630
    Abstract: A perpendicular magnetic recording (PMR) disk used in energy assisted magnetic recording drives is described. The PMR disk includes a substrate, a magnetic recording layer disposed above the substrate, an exchange coupling layer disposed above the magnetic recording layer, and a capping layer disposed above the exchange coupling layer. The capping layer has a Curie temperature greater than the Curie temperature of the magnetic recording layer.
    Type: Grant
    Filed: April 24, 2014
    Date of Patent: April 7, 2015
    Assignee: Western Digital Technologies, Inc.
    Inventors: Gerardo A. Bertero, Michael Alex, Christopher B. Wolf, Eric J. Champion
  • Energy assisted magnetic recording medium capable of suppressing high DC readback noise
    Patent number: 8743666
    Abstract: A perpendicular magnetic recording (PMR) disk used in energy assisted magnetic recording drives is described. The PMR disk includes a substrate, a magnetic recording layer disposed above the substrate, an exchange coupling layer disposed above the magnetic recording layer, and a capping layer disposed above the exchange coupling layer. The capping layer has a Curie temperature greater than the Curie temperature of the magnetic recording layer.
    Type: Grant
    Filed: March 8, 2011
    Date of Patent: June 3, 2014
    Assignee: Western Digital Technologies, Inc.
    Inventors: Gerardo A. Bertero, Michael Alex, Christopher B. Wolf, Eric J. Champion
  • Magneto-optical recording medium, method of manufacturing magneto-optical recording medium, method of recording on magneto-optical recording medium, and method of reproduction from magneto-optical recording medium
    Patent number: 7235313
    Abstract: A magneto-optical medium has a recording layer having a plurality of columns extending in a lamination direction, and a reproduction layer which is placed below the recording layer and which functions as a nucleus for the columns.
    Type: Grant
    Filed: October 8, 2003
    Date of Patent: June 26, 2007
    Assignee: Matsushita Electic Industrial Co., Ltd.
    Inventors: Motoyoshi Murakami, Masahiro Birukawa
  • Magneto-optical recording for improved domain expansion reading
    Patent number: 7027365
    Abstract: The present invention relates to magneto-optical recording technique whereby improved domain expansion reading is achieved. A mark region is recorded as a sub-mark portion and an adjacent sub-space portion, wherein the length of the sub-mark portion is set to be less than or equal to the length of the sub-space portion. Stray field variations due to different runlengths of the recording data can thus be equalized even for short channel bit lengths, while the resolution and/or power margin is improved.
    Type: Grant
    Filed: June 17, 2002
    Date of Patent: April 11, 2006
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Coen Adrianus Verschuren, Bart Van Rompaey, Paulus Wilhelmus Maria Blom, Jeroen Jan Lambertus Horikx, Hans Willem Van Kesteren
  • Magneto-optical recording for improved domain expansion reading
    Publication number: 20020191497
    Abstract: The present invention relates to magneto-optical recording technique whereby improved domain expansion reading is achieved. A mark region is recorded as a sub-mark portion and an adjacent sub-space portion, wherein the length of the sub-mark portion is set to be less than or equal to the length of the sub-space portion. Stray field variations due to different runlengths of the recording data can thus be equalized even for short channel bit lengths, while the resolution and/or power margin is improved.
    Type: Application
    Filed: June 17, 2002
    Publication date: December 19, 2002
    Applicant: Koninklijke Philips Electronics N.V.
    Inventors: Coen Adrianus Verschuren, Bart Van Rompaey, Paulus Wilhelmus Maria Blom, Jeroen Jan Lambertus Horikx, Hans Willem Van Kesteren