Energy-Efficient and Robust Associative Computing with Injection-Locked Dual-Pillar Spin-Torque Oscillators

Mrigank Sharad, Deliang Fan, Kaushik Roy

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


In this paper, we show that the dynamics of injection-locked spin-torque oscillators (STOs) can be exploited for non-Boolean information processing, such as associative computing. Injection locking employs phase synchronization of multiple STOs to a common injected ac current. DC inputs derived from external stimuli can be used to conditionally unlock some of the STOs. This phenomenon can be used for pattern identification. In such a scheme, stronger ac current injection can provide variation- and noise-tolerant global synchronization required for robust computation. We analyze dual-pillar STO (DP-STO) for low-power computing using injection locking method. A DP-STO offers a low-resistance bias terminal for ultralow-voltage ac injection, leading to low biasing power. Simultaneously, it provides a separate high-resistance sensing terminal with a large output swing, leading to compact and low-power sensing interface. Thus, an array of injection-locked DP-STOs can be suitable for energy-efficient and robust non-Boolean computing.

Original languageEnglish (US)
Article number7017509
JournalIEEE Transactions on Magnetics
Issue number7
StatePublished - Jul 1 2015
Externally publishedYes


  • Associative computing
  • injection locking
  • magnetic coupling
  • spin-torque oscillator (STO)
  • spin-transfer torque (STT)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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