Asymmetric dipolar ring

Static information storage and retrieval – Systems using particular element – Ferroelectric

Reexamination Certificate

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C365S171000

Reexamination Certificate

active

07835168

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.

REFERENCES:
patent: 2004/0195542 (2004-10-01), Bellaiche et al.
Chien, C., et al., Patterned nanomagnets, Physics Today, pp. 40-45, Jun. 2007.
Zhu, F., et al., Magnetic Bistability and Controllable Reversal of Asymmetric Ferromagnetic Nanorings, Phys. Rev. Ltrs. 96, pp. 027205-1-027205-4, Jan. 17, 2006.
Prosandeev, S., et al., Original properties of dipole vortices in zero-dimensional ferroelectrics, J. Phys.: Condens. Matter 20 (2008) 193201, pp. 1-14, Apr. 8, 2008.
Prosandeev, S., et al., Controlling Double Vortex States in Low-Dimensional Dipolar Systems, Phys. Rev. Ltrs. 101, pp. 097203-1-097203-4, Aug. 26, 2008.
Prosandeev, S., et al., Order parameter in complex dipolar structures: Microscopic modeling, Phys. Rev. B 77, pp. 060101-1-060101-4, Feb. 7, 2008.
Prosandeev, S., et al., Tensors in ferroelectric nanoparticles: First-principles-based simulations, Phys. Rev. B 76, pp. 012101-1-012101-4, Jul. 6, 2007.
Prosandeev, S., et al., Control of Vortices by Homogeneous Fields in Asymmetric Ferroelectric and Ferromagnetic Rings, Phys. Rev. Ltrs. 100, pp. 047201-1-047201-4, Jan. 28, 2008.

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