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The Fermi-Dirac function is represented by an S-shaped curve indicating the probability of an energy state being occupied by an electron at a given temperature. The Fermi level is the energy level at which there is a fifty percent chance of finding an electron, and it is positioned between the lower-energy valence band and the higher-energy conduction band.
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Low Power In-Memory Computation with Reciprocal Ferromagnet/Topological Insulator Heterostructures.

Hamed Vakili1, Samiran Ganguly2,3, George J de Coster4

  • 1Department of Physics, University of Virginia, Charlottesville, Virginia22904, United States.

ACS Nano
|December 2, 2022
PubMed
Summary
This summary is machine-generated.

We propose a novel 1-transistor 1-magnetic tunnel junction random access memory (1T1MTJ RAM) using topological insulator (3DTI) and ferromagnet (FM) heterostructures for ultra-low power Processing-in-Memory (PiM). This design leverages reciprocal spin-orbit torque and gating effects for efficient data storage and processing.

Keywords:
3D topological insulatorferromagnetic heterostructuresin-memory computingquantum transportspintronics

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Area of Science:

  • Spintronics and Materials Science
  • Condensed Matter Physics
  • Advanced Memory Architectures

Background:

  • 3D topological insulators (3DTI) possess spin-momentum locked surface states with a large spin Hall angle.
  • Ferromagnetic (FM) materials can be switched using spin-orbit torques originating from TI surface states.
  • Reciprocal control exists where FM magnetization gating can modulate TI surface currents.

Purpose of the Study:

  • To design an integrated 1-transistor 1-magnetic tunnel junction random access memory (1T1MTJ RAM) unit.
  • To enable an ultra-low power Processing-in-Memory (PiM) architecture.
  • To exploit the reciprocal spin-orbit torque and gating effects in FM/3DTI heterostructures.

Main Methods:

  • Combined theoretical approach integrating the Fokker-Planck equation for electron transport.
  • Nonequilibrium Green Function (NEGF) formalism for conduction electron dynamics.
  • Landau-Lifshitz-Gilbert (LLG) equation for magnetization dynamics.

Main Results:

  • Demonstrated the feasibility of using two FM/3DTI heterostructures for 1T1MTJ RAM.
  • Established a link between device performance metrics and fundamental material parameters.
  • Provided a pathway for guiding experimental and fabrication efforts in spintronic memory.

Conclusions:

  • The proposed FM/3DTI heterostructure design enables ultra-low power PiM architectures.
  • The reciprocal spin-orbit torque and gating effects are crucial for device functionality.
  • This work offers a theoretical framework for developing next-generation memory devices.