Testing STT-MRAM: Manufacturing Defects, Fault Models, and Test Solutions

Research output: ThesisDissertation (TU Delft)

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Abstract

As STT-MRAM mass production and deployment in industry is around the corner, high-quality yet cost-efficient manufacturing test solutions are crucial to ensure the required quality of products being shipped to end customers. This dissertation focuses on STT-MRAM testing, covering three abstraction levels: manufacturing defects, fault models, and test solutions. We apply the advanced device-aware test (DAT) approach to STT-MRAM defects, including resistive defects on interconnects and STT-MRAM device-internal defects such as pinhole defects, synthetic anti-ferromagnet flip defects, intermediate state defects. With the derived accurate defect models calibrated by silicon data, a comprehensive fault analysis based on SPICE circuit simulations is performed. STT-MRAM unique faults are identified, including both permanent faults and intermittent faults. Based on the obtain fault models, high-quality test solutions are proposed. Additionally, this dissertation also explores the impact of magnetic coupling and density on STT-MRAM performance for robust designs.
Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
  • Delft University of Technology
Supervisors/Advisors
  • Hamdioui, S., Supervisor
  • Taouil, M., Advisor
Award date22 Feb 2021
Print ISBNs978-94-6384-199-3
DOIs
Publication statusPublished - 2021

Keywords

  • memory test
  • device-aware test
  • manufacturing test
  • STT-MRAM
  • MTJ
  • manufacturing defect
  • fault model
  • robust design
  • magnetic coupling

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