Title: Ferroelectric nanostructure having switchable multi-stable vortex states

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.

Inventors:

Naumov, Ivan I ^[1]; Bellaiche, Laurent M ^[1]; Prosandeev, Sergey A ^[1]; Ponomareva, Inna V ^[1]; Kornev, Igor A ^[1]

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+ Show Inventor Affiliations

1. Fayetteville, AR

Issue Date:

2009-09-22

Research Org.:

University of Arkansas

Sponsoring Org.:

USDOE

OSTI Identifier:

988686

Patent Number(s):

7593250

Application Number:

11/811,444

Assignee:

Board of Trustees of the University of Arkansas (Little Rock, AK)

Patent Classifications (CPCs):

G - PHYSICS G11 - INFORMATION STORAGE G11C - STATIC STORES

G - PHYSICS G11 - INFORMATION STORAGE G11B - INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER

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G - PHYSICS G11 - INFORMATION STORAGE G11C - STATIC STORES

G11C11/22 - using ferroelectric elements {

G - PHYSICS G11 - INFORMATION STORAGE G11B - INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER

G11B9/02 - using ferroelectric record carriers

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DOE Contract Number:  

FG02-05ER46188

Resource Type:

Patent

Country of Publication:

United States

Language:

English

Subject:

36 MATERIALS SCIENCE