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Spin Inertia and Auto-Oscillations in Ferromagnets.

Rodolfo Rodriguez1, Mikhail Cherkasskii2, Rundong Jiang1

  • 1Department of Physics and Astronomy, <a href="https://ror.org/03nawhv43">University of California</a>, Riverside, California 92521, USA.

Physical Review Letters
|July 1, 2024
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Summary
This summary is machine-generated.

Spin inertia in ferromagnets enables new auto-oscillation dynamics crucial for THz technologies. This study introduces nutational auto-oscillations, paving the way for ultrahigh frequency applications and knowledge transfer in spintronics.

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Area of Science:

  • Spintronics
  • Condensed Matter Physics
  • THz Technologies

Background:

  • Ferromagnets are key for spintronic devices operating at THz frequencies.
  • Spin inertia's impact on spin-torque dynamics in ferromagnets is largely unexplored.
  • Auto-oscillations are critical for spin-based technologies.

Purpose of the Study:

  • To develop a theoretical framework for precessional auto-oscillations in ferromagnets considering spin inertia.
  • To investigate the effect of spin inertia on spin-torque driven dynamics.
  • To introduce and analyze nutational auto-oscillations.

Main Methods:

  • Theoretical modeling of spin dynamics in ferromagnets.
  • Analysis of spin-torque driven auto-oscillations with spin inertia.
  • Derivation of an isomorphism between spin dynamics in ferrimagnets and inertial ferromagnets.

Main Results:

  • Established a theoretical framework for auto-oscillations in ferromagnets with spin inertia.
  • Discovered and introduced the concept of nutational auto-oscillations.
  • Demonstrated the potential of nutational auto-oscillations for ultrahigh frequency applications.

Conclusions:

  • Spin inertia significantly influences spin-torque driven dynamics in ferromagnets.
  • Nutational auto-oscillations offer a new pathway for THz spintronic devices.
  • An isomorphism between ferrimagnet and inertial ferromagnet dynamics facilitates cross-field knowledge transfer.