MTJ-Based p-Bit Designs for Enhanced Tunability

Saleh Bunaiyan*, Feras Al-Dirini

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Probabilistic bits (p-bits) can be viewed as tunable random number generators (RNGs), whose stochasticity coupled with their tunability makes them enablers for an emerging class of applications, including probabilistic computing. Their tunability is the feature that makes them unique to conventional RNGs. This paper studies the tunability range of existing p-bit designs reported in the literature, highlighting that existing designs have a limited input voltage range within which the p-bit's stochastic response can be tuned, on the order of sub 0.5 V. This may greatly limit their scalability in large p-bit networks. Accordingly, this work proposes several variant p-bit designs that enable a wider input voltage tunability range and a more continuous response for p-bits. The designs employ both bipolar and continuous stochastic MTJs, and demonstrate an enhancement in the tunability range beyond 4 V (close to half of the supply voltage range).

Original languageEnglish
Title of host publication2022 IEEE Nanotechnology Materials and Devices Conference, NMDC 2022
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages3
ISBN (Electronic)9781728174105
StatePublished - 2022
Event2022 IEEE Nanotechnology Materials and Devices Conference, NMDC 2022 - Nanjing, China
Duration: 18 Nov 202220 Nov 2022

Publication series

Name2022 IEEE Nanotechnology Materials and Devices Conference, NMDC 2022


Conference2022 IEEE Nanotechnology Materials and Devices Conference, NMDC 2022

Bibliographical note

Publisher Copyright:
© 2022 IEEE.


  • MTJ
  • low barrier magnets (LBM)
  • p-bit
  • p-bit network
  • probabilistic
  • stochastic
  • tunability

ASJC Scopus subject areas

  • Hardware and Architecture
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Instrumentation


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