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Spin-Orbit Torque-Driven Perpendicular Magnetization Switching for Artificial Synapses in Co/Ho Multilayer Systems.

Shaomin Li1,2,3, Yidan Wei4, Yuanyuan Chen1,3

  • 1School of Integrated Circuits, Jiangnan University, Wuxi 214401, China.

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|February 26, 2026
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Summary

This study explores Co/Ho multilayer systems for advanced artificial synaptic devices. These materials demonstrate efficient spin-orbit torque (SOT) switching, enabling multistate behavior crucial for neuromorphic computing applications.

Keywords:
artificial synapsesrare earth materialspin-orbit torquespintronic devices

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Area of Science:

  • Spintronics
  • Materials Science
  • Neuromorphic Engineering

Background:

  • Spin-orbit torque (SOT)-based spintronic devices are promising for artificial synapses due to non-volatility, speed, and low power.
  • High-performance SOT artificial synaptic devices require breakthroughs in SOT-driven magnetization switching.
  • The magnetic layer's performance and structure are critical for SOT device development.

Purpose of the Study:

  • Investigate SOT-driven magnetization switching characteristics of Co/Ho multilayer systems.
  • Explore the application potential of Co/Ho multilayers in artificial synapses.
  • Optimize Co/Ho multilayer structures for enhanced SOT efficiency and magnetic properties.

Main Methods:

  • Fabrication and characterization of Co/Ho multilayer structures with varying periodic parameters.
  • Investigation of SOT-driven magnetization switching behavior.
  • Analysis of perpendicular magnetic anisotropy (PMA) and spin Hall angle.

Main Results:

  • Stable high perpendicular magnetic anisotropy (PMA) achieved in thick Co/Ho layers by tuning periodic parameters.
  • Elucidation of antiferromagnetic coupling at the Co/Ho interface enhancing SOT efficiency.
  • Demonstrated high spin Hall angle (up to 0.22) and efficient SOT switching of an 8.4 nm magnetic layer.
  • Observed multistate magnetization switching behavior suitable for synaptic weight updates.

Conclusions:

  • Co/Ho multilayer systems offer a viable platform for high-performance SOT artificial synaptic devices.
  • Optimized multilayer structures and understanding interfacial effects significantly boost SOT efficiency.
  • The demonstrated multistate switching highlights the potential for neuromorphic computing applications.