Energy Efficient Voltage Controlled Domain Wall Neuron and Synapse

ORAL

Abstract

We present micromagnetic simulation of voltage-controlled spintronic neuron and synapse by utilizing domain wall (DW) motion in the free layer of a Magnetic Tunnel Junction (MTJ). The free layer is a soft ferromagnet (CoFeB) exchange coupled to a magnetostrictive Rare Earth Iron Garnet (REIG) racetrack with perpendicular magnetic anisotropy (PMA) deposited on a heavy metal layer. The whole stack is fabricated on a piezoelectric substrate. Chiral domain walls can be introduced in the free layer due to PMA and Dzyaloshinskii-Moriya Interaction (DMI) [1, 2], translated with spin orbit torque by applying a current pulse to the heavy metal layer and arrested at specific location along the racetrack domain by tuning the bulk PMA of the magnetic layer using a highly localized voltage-generated strain from the piezoelectric layer. Micromagnetic simulations with realistic defects and thermal noise will be presented for an energy efficient neuron and non-volatile programmable synapse using this device.

Refrences:
[1] C. O. Avci, et al., Nature Materials, 16, 309, 2017.
[2] E.R. Rosenberg, et al., Physical Review Materials, 2, 094405, 2018.

*M. A. A, D.B and J.A acknowledge NSF CAREER grant CCF-1253370.

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Presenters

  • Md Ali Azam

    • Department of Mechanical and Nuclear Engineering, Virginia Commonwealth University

Authors

  • Md Ali Azam

    • Department of Mechanical and Nuclear Engineering, Virginia Commonwealth University

  • Dhritiman Bhattacharya

    • Virginia Commonwealth University
    • Department of Mechanical and Nuclear Engineering, Virginia Commonwealth University

  • Caroline Anne Ross

    • Massachusetts Institute of Technology
    • Department of Materials Science and Engineering, Massachusetts Institute of Technology
    • MIT
    • Materials Science and Engineering, Massachusetts Institute of Technology

  • Damien Querlioz

    • Centre de Nanosciences et de Nanotechnologies, University of Paris-Sud
    • Univ Paris-Sud

  • Jayasimha Atulasimha

    • Virginia Commonwealth University
    • Department of Mechanical and Nuclear Engineering, Virginia Commonwealth University
    • Virginia Commonwealth Univ