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Newton's second law in spin-orbit torque.

Cong Son Ho1, Seng Ghee Tan2,3, Shun-Qing Shen4

  • 1Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, 117576, Singapore.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|August 22, 2018
PubMed
Summary
This summary is machine-generated.

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Researchers describe spin-orbit torque (SOT) as a spin force, offering a new perspective on magnetization dynamics. This model explains energy transfer to electrons and Joule heating in Rashba systems.

Area of Science:

  • Condensed matter physics
  • Spintronics
  • Quantum mechanics

Background:

  • Spin-orbit torque (SOT) drives magnetization dynamics using spin-orbit coupling (SOC) and electric currents.
  • Existing models for SOT can be complex, necessitating simpler, more intuitive descriptions.

Purpose of the Study:

  • To introduce a novel, force-based description of spin-orbit torque.
  • To provide an intuitive framework for understanding SOT in Rashba systems.
  • To establish a connection between SOT, energy transfer, and thermal dissipation.

Main Methods:

  • Developed a theoretical model describing SOT as a spin force in Rashba SOC systems.
  • Formulated equations for SOT magnitude and associated Joule heating rates.
  • Proposed experimental verification using anisotropic magnetoresistance measurements.

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Main Results:

  • The damping-like SOT in Rashba systems is described analogously to classical torque-force relations.
  • Magnetic energy is transferred to conduction electrons, leading to dissipation via Joule heating.
  • The rate of Joule heating is directly related to the applied current density.

Conclusions:

  • The spin force model offers a simplified and intuitive understanding of SOT.
  • The model highlights the energy transfer and dissipation mechanisms within spintronic devices.
  • Experimental validation via anisotropic magnetoresistance is proposed to confirm the theoretical findings.