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The double-exchange interaction, typically ferromagnetic, becomes antiferromagnetic in photoexcited states. This study reveals a hidden antiferromagnetic coupling under nonequilibrium conditions, converting metallic ferromagnets to antiferromagnets.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Mechanics
  • Materials Science

Background:

  • The double-exchange (DE) interaction is a primary mechanism driving ferromagnetic (FM) order in materials.
  • Understanding electron-spin coupling is crucial for designing novel magnetic states.

Purpose of the Study:

  • To investigate the nature of the DE interaction in highly photoexcited states.
  • To explore the transient dynamics of electron-spin coupling under nonequilibrium conditions.
  • To identify mechanisms for switching magnetic states.

Main Methods:

  • Analysis of transient dynamics involving quantum electrons and classical spins.
  • Application of an AC field to a metallic FM state.
  • Modeling electron-spin coupling under photoexcitation.

Main Results:

  • The DE interaction exhibits antiferromagnetic (AFM) behavior in highly photoexcited states.
  • An applied AC field can induce a transition from an FM to an AFM (Néel) state.
  • The FM-to-AFM conversion time is dependent on light amplitude and frequency.

Conclusions:

  • A hidden AFM interaction exists within the DE mechanism under nonequilibrium electron distributions.
  • Photoexcitation provides a pathway to control and potentially switch magnetic ordering.
  • This finding opens new avenues for manipulating magnetic properties in materials.