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Stochastic magnetic actuated random transducer devices based on perpendicular magnetic tunnel junctions

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Title: Stochastic magnetic actuated random transducer devices based on perpendicular magnetic tunnel junctions
Authors: Rehm, Laura, Capriata, Corrado Carlo Maria, Shashank, Misra, Smith, J. Darby, Pinarbasi, Mustafa, Malm, B. Gunnar, Kent, Andrew D.
Source: Phys. Rev. Applied 19, 024035 (2023)
Publication Year: 2022
Collection: Condensed Matter
Physics (Other)
Subject Terms: Physics - Applied Physics, Condensed Matter - Mesoscale and Nanoscale Physics
More Details: True random number generators are of great interest in many computing applications such as cryptography, neuromorphic systems and Monte Carlo simulations. Here we investigate perpendicular magnetic tunnel junction nanopillars (pMTJs) activated by short duration (ns) pulses in the ballistic limit for such applications. In this limit, a pulse can transform the Boltzmann distribution of initial free layer magnetization states into randomly magnetized down or up states, i.e. a bit that is 0 or 1, easily determined by measurement of the junction's tunnel resistance. It is demonstrated that bitstreams with millions of events: 1) are very well described by the binomial distribution; 2) can be used to create a uniform distribution of 8-bit random numbers; 3) pass multiple statistical tests for true randomness, including all the National Institute of Standards tests for random number generators with only one XOR operation; and 4) can have no drift in the bit probability with time. The results presented here show that pMTJs operated in the ballistic regime can generate true random numbers at GHz bitrates, while being more robust to environmental changes, such as their operating temperature, compared to other stochastic nanomagnetic devices.
Comment: 8 pages, 3 figures, 2 tables, will be submitted to peer-reviewed journal
Document Type: Working Paper
DOI: 10.1103/PhysRevApplied.19.024035
Access URL: http://arxiv.org/abs/2209.01480
Accession Number: edsarx.2209.01480
Database: arXiv
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  Data: Stochastic magnetic actuated random transducer devices based on perpendicular magnetic tunnel junctions
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  Data: <searchLink fieldCode="AR" term="%22Rehm%2C+Laura%22">Rehm, Laura</searchLink><br /><searchLink fieldCode="AR" term="%22Capriata%2C+Corrado+Carlo+Maria%22">Capriata, Corrado Carlo Maria</searchLink><br /><searchLink fieldCode="AR" term="%22Shashank%2C+Misra%22">Shashank, Misra</searchLink><br /><searchLink fieldCode="AR" term="%22Smith%2C+J%2E+Darby%22">Smith, J. Darby</searchLink><br /><searchLink fieldCode="AR" term="%22Pinarbasi%2C+Mustafa%22">Pinarbasi, Mustafa</searchLink><br /><searchLink fieldCode="AR" term="%22Malm%2C+B%2E+Gunnar%22">Malm, B. Gunnar</searchLink><br /><searchLink fieldCode="AR" term="%22Kent%2C+Andrew+D%2E%22">Kent, Andrew D.</searchLink>
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  Data: Phys. Rev. Applied 19, 024035 (2023)
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  Data: 2022
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  Data: True random number generators are of great interest in many computing applications such as cryptography, neuromorphic systems and Monte Carlo simulations. Here we investigate perpendicular magnetic tunnel junction nanopillars (pMTJs) activated by short duration (ns) pulses in the ballistic limit for such applications. In this limit, a pulse can transform the Boltzmann distribution of initial free layer magnetization states into randomly magnetized down or up states, i.e. a bit that is 0 or 1, easily determined by measurement of the junction's tunnel resistance. It is demonstrated that bitstreams with millions of events: 1) are very well described by the binomial distribution; 2) can be used to create a uniform distribution of 8-bit random numbers; 3) pass multiple statistical tests for true randomness, including all the National Institute of Standards tests for random number generators with only one XOR operation; and 4) can have no drift in the bit probability with time. The results presented here show that pMTJs operated in the ballistic regime can generate true random numbers at GHz bitrates, while being more robust to environmental changes, such as their operating temperature, compared to other stochastic nanomagnetic devices.<br />Comment: 8 pages, 3 figures, 2 tables, will be submitted to peer-reviewed journal
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        Value: 10.1103/PhysRevApplied.19.024035
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      – SubjectFull: Condensed Matter - Mesoscale and Nanoscale Physics
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      – TitleFull: Stochastic magnetic actuated random transducer devices based on perpendicular magnetic tunnel junctions
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