Patents by Inventor Bengt Johan Rothman

Bengt Johan Rothman 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 element with switchable domain structure
    Patent number: 7102477
    Abstract: A magnetic element comprises a closed loop of ferromagnetic material having an even number of magnetic domains of opposite sense. The magnetisation within the domains is in a circumferential direction, and the domains have leading and trailing walls extending from the inside to the outside of the loop. The magnetic element has a geometry such that there are at least two stable equilibrium domain configurations in which the domain walls are confined in predetermined portions of the loop and wherein the element is switchable between the stable configurations upon the application of a external magnetic field.
    Type: Grant
    Filed: August 7, 2001
    Date of Patent: September 5, 2006
    Assignee: Cambridge University Technical Services Ltd.
    Inventors: James Anthony Charles Bland, Bengt Johan Rothman, Luis Lopez Diaz, Mathias Kläui
  • Magnetic element with switchable domain structure
    Publication number: 20040021539
    Abstract: A magnetic element comprises a closed loop of ferromagnetic material having an even number of magnetic domains of opposite sense. The magnetisation within the domains is in a circumferenial direction, and the domains have leading and trailing walls extending from the inside to the outside of this loop. The magnetic element has a geometry such that there are at least two stable equilibrium domain configurations in which the domain walls are confined in predetermined portions of the loop and wherein the element is switchable between the stable configurations upon the application of a external magnetic field.
    Type: Application
    Filed: August 20, 2003
    Publication date: February 5, 2004
    Inventors: James Anthony Charles Bland, Bengt Johan Rothman, Luis Lopez Diaz, Mathias Klaus