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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Dynamic Magnonic Crystals Based on Spatiotemporal Plasmon Excitation.

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Summary

This study presents a hybrid magnonic-plasmonic metamaterial for controlling spin waves. The device uses laser-induced thermal modulation to create tunable bandgaps for wave-based computing applications.

Keywords:
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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Metamaterials offer unique physical properties through engineered band structures.
  • Controlling spin-wave transport is crucial for advanced computing paradigms.

Purpose of the Study:

  • To develop a hybrid magnonic-plasmonic metamaterial for precise spatiotemporal control of spin waves.
  • To demonstrate laser-induced dynamic modulation of magnetic properties for magnonic applications.

Main Methods:

  • Integration of plasmonic metamaterial (Au nanodisk arrays) with a yttrium iron garnet (YIG) film.
  • Excitation of surface lattice resonances (SLRs) using short laser pulses for thermoplasmonic heating.
  • Time-resolved propagating spin-wave spectroscopy to analyze spin-wave dynamics.

Main Results:

  • Demonstration of a laser-controlled magnonic crystal via dynamic thermal modulation of YIG magnetization.
  • Observation of tunable bandgaps and minibands in spin-wave propagation due to Bragg reflection.
  • Achieved control over spin-wave transport at micrometer scales and sub-microsecond timescales.

Conclusions:

  • The hybrid metamaterial enables precise, reconfigurable control over spin-wave transport.
  • This technology holds promise for developing advanced wave-based computing devices.
  • Flexible band structure engineering in metamaterials unlocks novel functionalities.