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Current driven spin-orbit torque oscillator: ferromagnetic and antiferromagnetic coupling.

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Area of Science:

  • Condensed Matter Physics
  • Spintronics
  • Materials Science

Background:

  • Spin torque oscillators (STOs) are crucial for magnetic memory and logic devices.
  • Synthetic ferromagnets and antiferromagnets offer tunable magnetic properties.
  • Spin-orbit coupling is a fundamental interaction influencing electron spin dynamics.

Purpose of the Study:

  • To theoretically investigate the influence of Rashba spin-orbit coupling on STOs.
  • To analyze STO behavior in synthetic ferromagnets and antiferromagnets.
  • To determine the stability of magnetic configurations and the STO phase diagram.

Main Methods:

  • Analytical determination of stable collinear magnetic states.
  • Numerical phase diagram construction for STO and stable configurations.
  • Theoretical modeling of Rashba spin-orbit coupling effects.

Main Results:

  • Rashba spin-orbit coupling induces anti-damping near collinear states.
  • This anti-damping assists spin transfer torque in generating self-sustained oscillations.
  • The STO phase diagram is substantially enlarged, extending into the antiferromagnetic regime.

Conclusions:

  • Rashba spin-orbit coupling significantly enhances STO performance in synthetic magnetic systems.
  • The findings suggest new pathways for designing advanced spintronic devices.
  • Spin-orbit torques offer a promising route to control and expand STO operation.