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Skyrmion motion under temperature gradient and application in logic devices.

Ravish Kumar Raj1, Namita Bindal1, Brajesh Kumar Kaushik1

  • 1Department of Electronics and Communication Engineering, Indian Institute of Technology, Roorkee 247667, India.

Nanotechnology
|November 28, 2023
PubMed
Summary

This study investigates skyrmion dynamics in various magnetic systems under temperature gradients and spin transfer torques. Researchers developed an energy-efficient logic device using magnetic skyrmions, demonstrating AND, OR, and half-adder functionalities.

Keywords:
antiferromagneticferromagneticlogicsskyrmionsynthetic anti-ferromagnetictemperature gradient

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Area of Science:

  • Spintronics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Skyrmion dynamics are crucial for next-generation memory and logic devices.
  • Understanding skyrmion behavior under thermal gradients and various torques is essential for device design.

Purpose of the Study:

  • Investigate skyrmion dynamics in ferromagnets, synthetic antiferromagnets, and antiferromagnets under temperature gradients.
  • Propose and analyze a magnetic skyrmion-based logic device for AND, OR, and half-adder operations.

Main Methods:

  • Simulated skyrmion dynamics under combined forces including magnonic spin transfer torque, thermal STT, entropic difference, and thermal induced dipolar field.
  • Analyzed skyrmion motion direction influenced by damping constants and temperature gradients.
  • Designed and evaluated a cross-coupled nanotrack device exploiting thermal gradients and electrical STT.

Main Results:

  • Damping constant significantly influences skyrmion motion direction (hotter/colder side) across different magnetic structures.
  • The proposed FM skyrmion device simultaneously performs AND and OR logic at 2x10^11 Am^-2.
  • Half-adder functionality is achieved by tuning current density to 3x10^11 Am^-2.
  • Low energy consumption demonstrated: 33.63 fJ for AND/OR, 25.06 fJ for half-adder.

Conclusions:

  • Skyrmion dynamics are controllable via temperature gradients and damping in various magnetic systems.
  • The proposed device offers simultaneous AND/OR and half-adder functionalities with high energy efficiency.
  • This work advances the development of ultra-high density and energy-efficient spintronic logic devices.