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Area of Science:

  • Condensed Matter Physics
  • Quantum Optics
  • Materials Science

Background:

  • Electromagnetism is fundamental, with light-wave electronics controlling electronic properties.
  • Magnetic properties are typically controlled indirectly and slowly, limiting spintronic applications.
  • Direct, ultrafast control of magnetism has been a long-standing challenge.

Purpose of the Study:

  • Introduce and demonstrate ultrafast coherent magnetism.
  • Achieve direct, light-field-driven manipulation of magnetic properties.
  • Establish optical frequencies as the speed limit for future spintronic devices.

Main Methods:

  • Developed an attosecond time-resolved magnetic circular dichroism detection scheme.
  • Utilized ab initio quantum dynamical modeling.
  • Investigated ferromagnetic layer stacks subjected to ultrashort laser pulses.

Main Results:

  • Achieved direct manipulation of magnetic properties by light's electric-field oscillations.
  • Reduced magnetic response time by two orders of magnitude.
  • Observed synchronized spin/orbital momentum transfer with light-field-driven charge relocation.

Conclusions:

  • Unveiled light-field coherent control of spin dynamics and macroscopic magnetic moments.
  • Demonstrated simultaneous control of electronic and magnetic properties for spintronics.
  • Established optical frequencies as the ultimate speed limit for coherent spintronic applications.