Superparamagnetic perpendicular magnetic tunnel junctions for true random number generators

Bradley Parks; Mukund Bapna; Julianne Igbokwe; Hamid Almasi; Weigang Wang; Sara A. Majetich

doi:10.1063/1.5006422

AIP Advances (May 2018)

Superparamagnetic perpendicular magnetic tunnel junctions for true random number generators

Bradley Parks,
Mukund Bapna,
Julianne Igbokwe,
Hamid Almasi,
Weigang Wang,
Sara A. Majetich

Affiliations

Bradley Parks: Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15235, USA
Mukund Bapna: Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15235, USA
Julianne Igbokwe: Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15235, USA
Hamid Almasi: Department of Physics and Astronomy, University of Arizona, Tucson, AZ 85721, USA
Weigang Wang: Department of Physics and Astronomy, University of Arizona, Tucson, AZ 85721, USA
Sara A. Majetich: Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15235, USA

DOI: https://doi.org/10.1063/1.5006422
Journal volume & issue: Vol. 8, no. 5
pp. 055903 – 055903-5

Abstract

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Superparamagnetic perpendicular magnetic tunnel junctions are fabricated and analyzed for use in random number generators. Time-resolved resistance measurements are used as streams of bits in statistical tests for randomness. Voltage control of the thermal stability enables tuning the average speed of random bit generation up to 70 kHz in a 60 nm diameter device. In its most efficient operating mode, the device generates random bits at an energy cost of 600 fJ/bit. A narrow range of magnetic field tunes the probability of a given state from 0 to 1, offering a means of probabilistic computing.

Published in AIP Advances

ISSN: 2158-3226 (Online)
Publisher: AIP Publishing LLC
Country of publisher: United States
LCC subjects: Science: Physics
Website: http://aipadvances.aip.org/

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