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Updated: Jun 27, 2025

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Temperature effect on a weighted vortex spin-torque nano-oscillator for neuromorphic computing.

Ren Li1, Yasser Rezaeiyan2, Tim Böhnert3

  • 1Department of Electrical and Computer Engineering, Aarhus University, 8200, Aarhus, Denmark. ren.li@ece.au.dk.

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|May 2, 2024
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Summary
This summary is machine-generated.

Fabricated magnetic tunnel junctions function as magnetic memories or nano-oscillators. Heating these devices enhances neuromorphic computing system performance, paving the way for VCSEL-assisted spintronic systems.

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Area of Science:

  • Spintronics
  • Neuromorphic Computing
  • Materials Science

Background:

  • Magnetic tunnel junctions (MTJs) are versatile spintronic devices.
  • MTJs can be configured as magnetic memories (MMs) or vortex spin-torque nano-oscillators (STNOs).
  • Neuromorphic computing systems (NCS) can leverage spintronic devices for advanced computation.

Purpose of the Study:

  • To investigate the impact of temperature on MTJ-based MMs and STNOs.
  • To explore temperature as a means to enhance the performance of spintronic neuromorphic computing systems.
  • To demonstrate the feasibility of using vertical-cavity surface-emitting lasers (VCSELs) for thermal control in NCS.

Main Methods:

  • Fabrication of MTJs with varying geometries for MM and STNO functionalities.
  • Systematic study of device performance under controlled temperature variations (25°C to 75°C).
  • Application of a neural network for waveform classification using the fabricated devices.

Main Results:

  • Temperature significantly influences the resistance of MMs (synaptic weights) and the output power of STNOs.
  • Heating MMs only, STNO only, or both resulted in output power increases of 24.7%, 72%, and 92.3%, respectively.
  • Demonstrated temperature-dependent modulation of magnetoresistance (TMR) in MMs.

Conclusions:

  • Temperature is a critical parameter for optimizing spintronic neuromorphic computing systems.
  • VCSEL-assisted thermal control offers a promising approach for enhancing NCS performance.
  • This research lays the groundwork for developing compact, high-speed spintronic NCS.