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Harnessing orbital Hall effect in spin-orbit torque MRAM.

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Ruthenium enhances spin-orbit torque (SOT) efficiency in magnetic random-access memory (MRAM) by over 30%. This leads to reduced switching current and power, paving the way for next-generation memory technologies.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Electrical Engineering

Background:

  • Spin-Orbit Torque (SOT) Magnetic Random-Access Memory (MRAM) offers advantages in power efficiency, nonvolatility, and performance for applications like cache memory.
  • Achieving efficient magnetization switching, data retention, and high-density integration in SOT MRAM necessitates ferromagnets with perpendicular magnetic anisotropy (PMA) and enhanced torques via the Orbital Hall Effect (OHE).

Purpose of the Study:

  • To engineer PMA [Co/Ni]3 ferromagnets on selected OHE layers (Ru, Nb, Cr).
  • To investigate the potential of theoretically predicted higher orbital Hall conductivity (OHC) to quantify torque and switching current in OHE/[Co/Ni]3 stacks.
  • To validate the application of Ruthenium (Ru) in devices for industrial contexts.

Main Methods:

  • Fabrication of PMA [Co/Ni]3 thin films on OHE layers including Ru, Nb, and Cr.
  • Characterization of magnetic properties and SOT switching behavior.
  • Quantification of damping-like torque efficiency and switching current.
  • Comparison of device performance using Ru OHE layers against a standard Pt layer.

Main Results:

  • Demonstrated approximately 30% enhancement in damping-like torque efficiency with a positive sign for the Ru OHE layer compared to pure Pt.
  • Observed approximately 20% reduction in switching current for Ru compared to Pt across over 250 devices.
  • Achieved more than a 60% reduction in switching power using Ru OHE layers.

Conclusions:

  • Ruthenium exhibits superior Orbital Hall Conductivity (OHC), validating theoretical predictions.
  • The use of Ru in OHE/[Co/Ni]3 stacks significantly improves SOT efficiency and reduces switching power.
  • These findings highlight the potential of enhanced orbital torques for advancing SOT-MRAM technology towards next-generation memory solutions.