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Laser-Driven Multiferroics and Ultrafast Spin Current Generation.

Masahiro Sato1,2,3,4, Shintaro Takayoshi5, Takashi Oka6,7

  • 1Department of Physics, Ibaraki University, Mito, Ibaraki 310-8512, Japan.

Physical Review Letters
|October 15, 2016
PubMed
Summary
This summary is machine-generated.

We demonstrate an ultrafast method to generate spin chirality and spin current in multiferroic magnets using a terahertz laser. This technique dynamically controls magnetic interactions, offering new possibilities for spintronic devices.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Optics

Background:

  • Multiferroic magnets exhibit complex magnetic ordering.
  • Controlling spin properties is crucial for advanced electronic devices.
  • Ultrafast optical methods offer precise control over material properties.

Purpose of the Study:

  • To propose an ultrafast method for generating spin chirality and spin current.
  • To investigate the dynamic control of magnetic interactions in multiferroic materials.
  • To explore resonant phenomena for enhanced spin control.

Main Methods:

  • Utilizing terahertz circularly polarized laser pulses.
  • Applying the Floquet formalism for periodically driven systems.
  • Performing numerical calculations to support theoretical predictions.

Main Results:

  • Demonstrated dynamic control of the Dzyaloshinskii-Moriya interaction.
  • Observed resonant enhancement of spin chirality with a static magnetic field.
  • Showed spin current generation using spatially modulated laser fields.

Conclusions:

  • The proposed method provides an ultrafast route to generate spin chirality and current.
  • Dynamic control of magnetic interactions is achievable via laser manipulation.
  • Potential applications in optospintronic devices are highlighted.