Patents by Inventor Fernando J. Castano

Fernando J. Castano 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).

  • Wheatstone-bridge magnetoresistive device
    Patent number: 8415755
    Abstract: A magnetoresistive Wheatstone-bridge structure includes a magnetoresistive ring structure. The magnetoresistive ring structure includes a first magnetic layer comprising a ferromagnetic material. A second magnetic layer also includes a ferromagnetic material. A non-magnetic spacer is positioned between the first magnetic layer and the second magnetic layer. A vacant open region is positioned in the center region of the magnetoresistive ring structure. A plurality of magnetic states can exist in either the first magnetic layer or second magnetic layer. Furthermore, the magnetoresistive Wheatstone-bridge structure includes a plurality of voltage and current contacts arranged symmetrically upon the magnetoresistive ring structure. The magnetic state of the ring is detected by measuring its resistance.
    Type: Grant
    Filed: September 25, 2007
    Date of Patent: April 9, 2013
    Assignee: Massachusetts Institute of Technology
    Inventors: Fernando J. Castano, Caroline A. Ross
  • WHEATSTONE-BRIDGE MAGNETORESISTIVE DEVICE
    Publication number: 20080074224
    Abstract: A magnetoresistive Wheatstone-bridge structure includes a magnetoresistive ring structure. The magnetoresistive ring structure includes a first magnetic layer comprising a ferromagnetic material. A second magnetic layer also includes a ferromagnetic material. A non-magnetic spacer is positioned between the first magnetic layer and the second magnetic layer. A vacant open region is positioned in the center region of the magnetoresistive ring structure. A plurality of magnetic states can exist in either the first magnetic layer or second magnetic layer. Furthermore, the magnetoresistive Wheatstone-bridge structure includes a plurality of voltage and current contacts arranged symmetrically upon the magnetoresistive ring structure. The magnetic state of the ring is detected by measuring its resistance.
    Type: Application
    Filed: September 25, 2007
    Publication date: March 27, 2008
    Inventors: Fernando J. Castano, Caroline A. Ross
  • Magnetic memory elements using 360° walls
    Patent number: 6906369
    Abstract: A magnetic-ring structure includes at least two states, and at least one twisted state that includes a 360° domain wall that can exist over a wide range of applied fields.
    Type: Grant
    Filed: February 10, 2004
    Date of Patent: June 14, 2005
    Assignee: Massachusetts Institute of Technology
    Inventors: Caroline A. Ross, Fernando J. Castano
  • Magnetic memory elements using 360 degree walls
    Publication number: 20040211996
    Abstract: A magnetic-ring structure includes at least two states, and at least one twisted state that includes a 360° domain wall that can exist over a wide range of applied fields.
    Type: Application
    Filed: February 10, 2004
    Publication date: October 28, 2004
    Inventors: Caroline A. Ross, Fernando J. Castano