Patents by Inventor Gonzalo Vallejo Fernandez

Gonzalo Vallejo Fernandez 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).

  • MAGNETIC STORAGE DISC BASED ON EXCHANGE-BIAS
    Publication number: 20160247529
    Abstract: There is provided a magnetic storage disc comprising a heat-assisted magnetic recording structure comprising an adjoining ferromagnetic sputtered layer and antiferromagnetic sputtered layer magnetically coupled to each other by a magnetic exchange interaction giving rise to exchange bias, wherein the anisotropy axis of the antiferromagnetic sputtered layer is configured to be perpendicular to at least one seed layer disposed between the antiferromagnetic sputtered layer and a supporting substrate. A magnetically soft layer is disposed between the antiferromagnetic sputtered layer and the at least one seed layer. A method of forming a magnetic recording disc is also provided.
    Type: Application
    Filed: February 23, 2015
    Publication date: August 25, 2016
    Inventors: Kevin O'Grady, Gonzalo Vallejo Fernandez
  • MAGNETIC STORAGE DISC BASED ON EXCHANGE-BIAS
    Publication number: 20160247531
    Abstract: There is provided a magnetic storage disc comprising a heat-assisted magnetic recording structure comprising an adjoining ferromagnetic sputtered layer and antiferromagnetic sputtered layer magnetically coupled to each other by a magnetic exchange interaction giving rise to exchange bias, wherein the anisotropy axis of the antiferromagnetic sputtered layer is configured to be perpendicular to at least one seed layer disposed between the antiferromagnetic sputtered layer and a supporting substrate. A magnetically soft layer is disposed between the antiferromagnetic sputtered layer and the at least one seed layer. A method of forming a magnetic recording disc is also provided.
    Type: Application
    Filed: November 11, 2015
    Publication date: August 25, 2016
    Inventors: Kevin O'Grady, Gonzalo Vallejo Fernandez
  • Method of pinning domain walls in a nanowire magnetic memory device
    Patent number: 9293184
    Abstract: There is provided a method of pinning domain walls in a magnetic memory device (10) comprising using an antiferromagnetic material to create domain wall pinning sites. Junctions (22) where arrays of ferromagnetic nanowires (16) and antiferromagnetic nanowires (20) cross exhibit a permanent exchange bias interaction between the ferromagnetic material and the antiferromagnetic material which creates domain wall pinning sites. The exchange bias field is between 30 to 3600 Oe and the anisotropy direction of the ferromagnetic elements is between 15 to 75° to an anisotropy direction of the antiferromagnetic elements.
    Type: Grant
    Filed: October 8, 2012
    Date of Patent: March 22, 2016
    Assignee: University of York
    Inventors: Kevin O'Grady, Gonzalo Vallejo Fernandez, Atsufumi Hirohata
  • METHOD OF PINNING DOMAIN WALLS IN A NANOWIRE MAGNETIC MEMORY DEVICE
    Publication number: 20140355337
    Abstract: There is provided a method of pinning domain walls in a magnetic memory device (10) comprising using an antiferromagnetic material to create domain wall pinning sites. Junctions (22) where arrays of ferromagnetic nanowires (16) and antiferromagnetic nanowires (20) cross exhibit a permanent exchange bias interaction between the ferromagnetic material and the antiferromagnetic material which creates domain wall pinning sites. The exchange bias field is between 30 to 3600 Oe and the anisotropy direction of the ferromagnetic elements is between 15 to 75° to an anisotropy direction of the antiferromagnetic elements.
    Type: Application
    Filed: October 8, 2012
    Publication date: December 4, 2014
    Applicant: University of York
    Inventors: Kevin O'Grady, Gonzalo Vallejo Fernandez, Atsufumui Hirohata