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Twisted light induced magnetic anisotropy changes in an interlayer exchange coupling system.

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Researchers developed a novel all-optical switching method for spintronics devices using twisted light (Laguerre-Gaussian beams). This technique modifies magnetic anisotropy by utilizing the orbital angular momentum of photons, enabling efficient high-speed data writing.

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Area of Science:

  • Spintronics
  • Optics
  • Materials Science

Background:

  • All-optical switching of magnetic materials is crucial for high-efficiency, high-speed spintronics data writing.
  • Current methods rely on femtosecond pulsed lasers with circular light helicities.

Purpose of the Study:

  • To demonstrate a new all-optical switching method using continuous-wave Laguerre-Gaussian beams.
  • To investigate the modification of magnetic anisotropy in an interlayer exchange coupling system using orbital angular momentum (OAM).

Main Methods:

  • Utilized a continuous-wave Laguerre-Gaussian beam (twisted light) to illuminate a Pt/Co/Ru/Co/Pt heterojunction.
  • Employed photons carrying orbital angular momentum (OAM) to alter magnetic properties.
  • Performed numerical calculations to understand the underlying mechanism.

Main Results:

  • A significant change in the magnetic easy axis of the heterojunction was observed upon illumination with OAM-carrying light.
  • The interaction mechanism involves dynamical phase rotation of the electric field, generating an in-plane current loop.
  • This current loop induces a perpendicular stray field, altering magnetic anisotropy.

Conclusions:

  • Orbital angular momentum in light can effectively switch magnetic anisotropy in spintronics systems.
  • This OAM-based all-optical switching offers a new pathway for advanced spintronics devices.
  • The findings open avenues for developing magnetic devices using light with OAM.