Patents by Inventor David J. Sellmyer

David J. Sellmyer 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).

  • Patent number: 6555252
    Abstract: Disclosed is a modulated grain-composition magnetic recording material with up to terabit areal density recording capacity which, preferably, is produced by sequential vacuum deposition and subsequent annealing procedures that allow selective fabrication of magnetic material with desired grain size and coercivity, and with desired longitudinal or perpendicular magnetic particle “c-axis” orientation. The preferred magnetic recording material has multiple layers of FePt/B2O3 and/or Fe/Pt/B2O3, with minimum grain size of approximately ten (10) nanometers, with perpendicularly oriented “c-axis”, and with coercivity (Hc) of up to twelve (12) K-Oe. The preferred fabrication procedure involves sequential sputter deposition of FePt and B2O3 layers, followed by an anneal step.
    Type: Grant
    Filed: March 12, 2001
    Date of Patent: April 29, 2003
    Assignee: Board of Regents of the University of Nebraska
    Inventors: David J. Sellmyer, Chunping Luo
  • Publication number: 20010036562
    Abstract: Disclosed is a modulated grain-composition magnetic recording material with up to terabit areal density recording capacity which, preferably, is produced by sequential vacuum deposition and subsequent annealing procedures that allow selective fabrication of magnetic material with desired grain size and coercivity, and with desired longitudinal or perpendicular magnetic particle “c-axis” orientation. The preferred magnetic recording material has multiple layers of FePt/B2O3 and/or Fe/Pt/B2O3, with minimum grain size of approximately ten (10) nanometers, with perpendicularly oriented “c-axis”, and with coercivity (Hc) of up to twelve (12) K-Oe. The preferred fabrication procedure involves sequential sputter deposition of FePt and B2O3 layers, followed by an anneal step.
    Type: Application
    Filed: March 12, 2001
    Publication date: November 1, 2001
    Inventors: David J. Sellmyer, Chunping Luo
  • Patent number: 6139907
    Abstract: A high coercivity longitudinal recording media comprising FePt or similar thin films that are vacuum deposited by RF and DC sputtering. The as-deposited multilayered films are subjected to vacuum annealing. Due to the formation of the ordered phases of FePt or the like, which have very high crystal anisotropy, the annealed FePt films have large coercivity and fine grain size, suitable for use as ultra-high density magnetic recording media.
    Type: Grant
    Filed: May 14, 1998
    Date of Patent: October 31, 2000
    Assignee: Board of Regents, University of Nebraska-Lincoln
    Inventors: David J. Sellmyer, Chun-Ping Luo
  • Patent number: 6077617
    Abstract: Disclosed is a system made by a method for depositing rare-earth boride onto the surface of a substrate which is submerged in an organic solution of borane and a rare-earth halide. Application of electromagnetic radiation, preferably in the visible wavelength range, through a mask near the surface of the submerged substrate, drives the formation and deposition of rare-earth boride onto a substrate in desired patterns.
    Type: Grant
    Filed: November 2, 1999
    Date of Patent: June 20, 2000
    Assignee: Board of Regents of the University of Nebraska
    Inventors: Peter A. Dowben, Zenchen Zhong, David J. Sellmyer
  • Patent number: 6025038
    Abstract: Disclosed is a method for depositing rare-earth boride onto the surface of a substrate which is submerged in an organic solution of borane and a rare-earth halide. Application of electromagnetic radiation, preferably in the visible wavelength range, near the surface of the submerged substrate drives the formation and deposition of rare-earth boride onto a substrate.
    Type: Grant
    Filed: August 26, 1998
    Date of Patent: February 15, 2000
    Assignee: Board of Regents of the University of Nebraska
    Inventors: Peter A. Dowben, Zhenchen Zhong, David J. Sellmyer
  • Patent number: 5824409
    Abstract: A high coercivity longitudinal recording media comprising FePt or similar thin films that are vacuum deposited by RF and DC sputtering. The as-deposited multilayered films are subjected to vacuum annealing. Due to the formation of the ordered phases of FePt or the like, which have very high crystal anisotropy, the annealed FePt films have large coercivity and fine grain size, suitable for use as ultra-high density magnetic recording media.
    Type: Grant
    Filed: November 13, 1995
    Date of Patent: October 20, 1998
    Assignee: Board of Regents
    Inventors: David J. Sellmyer, Chun-Ping Luo