Performance of Magnetic Quantum Cellular Automata and Limitations Due to Thermal Noise

Author

Spedalieri, Federico M. ; Jacob, Ajey P. ; Nikonov, Dmitri E. ; Roychowdhury, Vwani P.

Author_Institution

Dept. of Electr. Eng., Univ. of California, Los Angeles, CA, USA

Volume

10

Issue

3

fYear

2011

fDate

5/1/2011 12:00:00 AM

Firstpage

537

Lastpage

546

Abstract

Operation parameters of magnetic quantum cellular automata are evaluated for the purposes of reliable logic operation. The dynamics of the nanomagnets is simulated via the Landau-Lifshitz-Gilbert equations with a stochastic magnetic field corresponding to thermal fluctuations. It is found that in the macrospin approximation, the switching speed does not change under scaling of both size and distances between nanomagnets. Thermal fluctuations put a limitation on the size of nanomagnets: when we consider a majority gate that features a biaxial anisotropy as a stabilizing mechanism and a uniform clocking field, the gate error rate becomes excessive for nanomagnets smaller than about 200 nm at room temperature.

Keywords

cellular automata; logic devices; stochastic processes; thermal noise; Landau-Lifshitz-Gilbert equations; biaxial anisotropy; macrospin approximation; magnetic quantum cellular automata; nanomagnets; stochastic magnetic field; thermal noise; Anisotropic magnetoresistance; Equations; Fluctuations; Logic; Magnetic anisotropy; Magnetic fields; Magnetic noise; Perpendicular magnetic anisotropy; Quantum cellular automata; Stochastic resonance; Bit error rate; magnetic logic devices; majority gate; micromagnetic simulation; nanomagnets; thermal fluctuations;

fLanguage

English

Journal_Title

Nanotechnology, IEEE Transactions on

Publisher

ieee

ISSN

1536-125X

Type

jour

DOI

10.1109/TNANO.2010.2050597

Filename

5473131