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An Ultrafast Image Recovery and Recognition System Implemented With Nanomagnets Possessing Biaxial Magnetocrystalline Anisotropy

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3 Author(s)
DrSouza, N. ; Dept. of Mech. & Nucl. Eng., Virginia Commonwealth Univ., Richmond, VA, USA ; Atulasimha, Jayasimha ; Bandyopadhyay, Supriyo

A circular magnetic disk with biaxial magnetocrystalline anisotropy has four stable magnetization states which can be used to encode a pixel's shade in a black/gray/white image. By solving the Landau-Lifshitz-Gilbert equation, we show that if moderate noise deflects the magnetization slightly from a stable state, it always returns to the original state, thereby automatically denoising the corrupted image. The same system can compare a noisy input image with a stored image and make a matching decision using magnetic tunnel junctions. These tasks are executed at ultrahigh speeds ( ~ 2 ns for a 512 ×512 pixel image).

Published in:

Nanotechnology, IEEE Transactions on  (Volume:11 ,  Issue: 5 )

Date of Publication:

Sept. 2012

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