Patents by Inventor Michael Z. Wu

Michael Z. Wu 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 granular perpendicular recording media for mechanical reliability and corrosion resistance
    Patent number: 9418693
    Abstract: An embodiment of the invention relates to a perpendicular magnetic recording medium comprising (1) a substrate, (2) an interlayer comprising hexagonal columns and (3) a magnetic layer, wherein the magnetic layer is deposited applying a bias voltage to the substrate such that the magnetic layer comprises magnetic grains having substantially no sub-grains within the magnetic layer, and the magnetic layer has perpendicular magnetic anisotropy.
    Type: Grant
    Filed: March 30, 2015
    Date of Patent: August 16, 2016
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Weilu Xu, Miaogen Lu, Mariana Rodica Munteanu, Michael Z. Wu, Shanghsien A. Rou, Steve Kuo-Hsing Hwang, Edward T. Yen
  • High Density Granular Perpendicular Recording Media for Mechanical Reliability and Corrosion Resistance
    Publication number: 20150279400
    Abstract: An embodiment of the invention relates to a perpendicular magnetic recording medium comprising (1) a substrate, (2) an interlayer comprising hexagonal columns and (3) a magnetic layer, wherein the magnetic layer is deposited applying a bias voltage to the substrate such that the magnetic layer comprises magnetic grains having substantially no sub-grains within the magnetic layer, and the magnetic layer has perpendicular magnetic anisotropy.
    Type: Application
    Filed: March 30, 2015
    Publication date: October 1, 2015
    Inventors: Weilu Xu, Miaogen Lu, Mariana Rodica Munteanu, Michael Z. Wu, Shanghsien A. Rou, Steve Kuo-Hsing Hwang, Edward T. Yen
  • Applying bias voltage during formation of granular recording media
    Patent number: 8993073
    Abstract: An embodiment of the invention relates to a perpendicular magnetic recording medium comprising (1) a substrate, (2) an interlayer comprising hexagonal columns and (3) a magnetic layer, wherein the magnetic layer is deposited applying a bias voltage to the substrate such that the magnetic layer comprises magnetic grains having substantially no sub-grains within the magnetic layer, and the magnetic layer has perpendicular magnetic anisotropy.
    Type: Grant
    Filed: July 14, 2008
    Date of Patent: March 31, 2015
    Assignee: Seagate Technology LLC
    Inventors: Weilu Xu, Miaogen Lu, Mariana R. Munteanu, Michael Z. Wu, Shanghsien Alex Rou, Steve Kuo-Hsing Hwang, Ed Yen
  • Method of making a multilayered magnetic structure
    Patent number: 7919201
    Abstract: A longitudinal magnetic recording medium comprising at least four magnetic layers including a substrate, a CoCrTa magnetic intermediate layer on the substrate, wherein the CoCrTa magnetic intermediate layer comprises Cr<16 at % and Ta<6 at %, a first CoCrPtB magnetic layer on the CoCrTa layer, wherein the first CoCrPtB magnetic layer comprises Cr: 10-14%, Pt: 4-8 at %, B: 6-10%, a second CoCrPtB magnetic layer on the first CoCrPtB magnetic layer, and a third CoCrPtB magnetic layer on the second CoCrPtB layer, wherein the third CoCrPtB magnetic layer comprises Cr: 12-16 at %, Pt: 12-16 at %, B: 10-14 at % and has <10 at % Cr than that in the second CoCrPtB magnetic layer is disclosed.
    Type: Grant
    Filed: November 13, 2008
    Date of Patent: April 5, 2011
    Assignee: Seagate Technology LLC
    Inventors: Li-Lien Lee, Michael Z. Wu, Shanghsien S. Rou
  • HIGH DENSITY GRANULAR PERPENDICULAR RECORDING MEDIA FOR MECHANICAL RELIABILITY AND CORROSION RESISTANCE
    Publication number: 20100007989
    Abstract: An embodiment of the invention relates to a perpendicular magnetic recording medium comprising (1) a substrate, (2) an interlayer comprising hexagonal columns and (3) a magnetic layer, wherein the magnetic layer is deposited applying a bias voltage to the substrate such that the magnetic layer comprises magnetic grains having substantially no sub-grains within the magnetic layer, and the magnetic layer has perpendicular magnetic anisotropy.
    Type: Application
    Filed: July 14, 2008
    Publication date: January 14, 2010
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Weilu Xu, Miaogen Lu, Mariana R. Munteanu, Michael Z. Wu, Shanghsien Alex Rou, Steve Kuo-Hsing Hwang, Ed Yen
  • HIGH DENSITY MAGNETIC RECORDING MEDIA
    Publication number: 20090104346
    Abstract: A longitudinal magnetic recording medium comprising at least four magnetic layers including a substrate, a CoCrTa magnetic intermediate layer on the substrate, wherein the CoCrTa magnetic intermediate layer comprises Cr <16 at % and Ta <6 at %, a first CoCrPtB magnetic layer on the CoCrTa layer, wherein the first CoCrPtB magnetic layer comprises Cr: 10-14%, Pt: 4-8 at %, B: 6-10%, a second CoCrPtB magnetic layer on the first CoCrPtB magnetic layer, and a third CoCrPtB magnetic layer on the second CoCrPtB layer, wherein the third CoCrPtB magnetic layer comprises Cr: 12-16 at %, Pt: 12-16 at %, B: 10-14 at % and has <10 at % Cr than that in the second CoCrPtB magnetic layer is disclosed.
    Type: Application
    Filed: November 13, 2008
    Publication date: April 23, 2009
    Applicant: Seagate Technology LLC
    Inventors: Li-Lien Lee, Michael Z. Wu, Shanghsien S. Rou
  • High density magnetic recording media
    Patent number: 7465501
    Abstract: A longitudinal magnetic recording medium comprising at least four magnetic layers including a substrate, a CoCrTa magnetic intermediate layer on the substrate, wherein the CoCrTa magnetic intermediate layer comprises Cr<16 at % and Ta<6 at %, a first CoCrPtB magnetic layer on the CoCrTa layer, wherein the first CoCrPtB magnetic layer comprises Cr: 10-14%, Pt: 4-8 at %, B: 6-10%, a second CoCrPtB magnetic layer on the first CoCrPtB magnetic layer, and a third CoCrPtB magnetic layer on the second CoCrPtB layer, wherein the third CoCrPtB magnetic layer comprises Cr: 12-16 at %, Pt: 12-16 at %, B: 10-14 at % and has <10 at % Cr than that in the second CoCrPtB magnetic layer is disclosed.
    Type: Grant
    Filed: December 22, 2004
    Date of Patent: December 16, 2008
    Assignee: Seagate Technology LLC
    Inventors: Li-Lien Lee, Michael Z. Wu, Shanghsien S. Rou
  • Perpendicular recording media with Ta transition layer to improve magnetic and corrosion resistance performances and method of manufacturing the same
    Publication number: 20080213628
    Abstract: A perpendicular magnetic recording medium comprising a substrate, an underlayer, a Ta-containing seedlayer, a magnetic layer, wherein the underlayer comprises a soft magnetic material and the Ta-containing seedlayer is between the underlayer and the magnetic layer, and a process for improving corrosion resistance of the recording medium and for manufacturing the recording medium are disclosed.
    Type: Application
    Filed: March 1, 2007
    Publication date: September 4, 2008
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Abebe Hailu, Raj Thangaraj, Miaogen Lu, Qixu Chen, Michael Z. Wu, Mariana R. Munteanu, Kuo-Hsing Hwang