Patents by Inventor Sergey A. Prosandeev

Sergey A. Prosandeev 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).

  • Asymmetric dipolar ring
    Patent number: 7835168
    Abstract: A device having a dipolar ring surrounding an interior region that is disposed asymmetrically on the ring. The dipolar ring generates a toroidal moment switchable between at least two stable states by a homogeneous field applied to the dipolar ring in the plane of the ring. The ring may be made of ferroelectric or magnetic material. In the former case, the homogeneous field is an electric field and in the latter case, the homogeneous field is a magnetic field.
    Type: Grant
    Filed: December 17, 2008
    Date of Patent: November 16, 2010
    Assignee: Board of Trustees of the University of Arkansas
    Inventors: Sergey A. Prosandeev, Inna V. Ponomareva, Igor A. Kornev, Laurent M. Bellaiche
  • Ferroelectric nanostructure having switchable multi-stable vortex states
    Patent number: 7593250
    Abstract: A ferroelectric nanostructure formed as a low dimensional nano-scale ferroelectric material having at least one vortex ring of polarization generating an ordered toroid moment switchable between multi-stable states. A stress-free ferroelectric nanodot under open-circuit-like electrical boundary conditions maintains such a vortex structure for their local dipoles when subject to a transverse inhomogeneous static electric field controlling the direction of the macroscopic toroidal moment. Stress is also capable of controlling the vortex's chirality, because of the electromechanical coupling that exists in ferroelectric nanodots.
    Type: Grant
    Filed: June 8, 2007
    Date of Patent: September 22, 2009
    Assignee: Board of Trustees of the University of Arkansas
    Inventors: Ivan I. Naumov, Laurent M. Bellaiche, Sergey A. Prosandeev, Inna V. Ponomareva, Igor A. Kornev
  • Asymmetric dipolar ring
    Publication number: 20090161404
    Abstract: A device having a dipolar ring surrounding an interior region that is disposed asymmetrically on the ring. The dipolar ring generates a toroidal moment switchable between at least two stable states by a homogeneous field applied to the dipolar ring in the plane of the ring. The ring may be made of ferroelectric or magnetic material. In the former case, the homogeneous field is an electric field and in the latter case, the homogeneous field is a magnetic field.
    Type: Application
    Filed: December 17, 2008
    Publication date: June 25, 2009
    Inventors: Sergey A. Prosandeev, Inna V. Ponomareva, Igor A. Kornev, Laurent M. Bellaiche
  • Ferroelectric nanostructure having switchable multi-stable vortex states
    Publication number: 20080130346
    Abstract: A ferroelectric nanostructure formed as a low dimensional nano-scale ferroelectric material having at least one vortex ring of polarization generating an ordered toroid moment switchable between multi-stable states. A stress-free ferroelectric nanodot under open-circuit-like electrical boundary conditions maintains such a vortex structure for their local dipoles when subject to a transverse inhomogeneous static electric field controlling the direction of the macroscopic toroidal moment. Stress is also capable of controlling the vortex's chirality, because of the electromechanical coupling that exists in ferroelectric nanodots.
    Type: Application
    Filed: June 8, 2007
    Publication date: June 5, 2008
    Inventors: Ivan I. Naumov, Laurent M. Bellaiche, Sergey A. Prosandeev, Inna V. Ponomareva, Igor A. Kornev