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Acoustic-driven magnetic skyrmion motion.

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Area of Science:

  • Spintronics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Magnetic skyrmions are promising for novel spintronic devices.
  • Current-driven spin-orbit torques are the primary method for electrical manipulation.
  • Surface acoustic waves (SAWs) offer a potential alternative for skyrmion manipulation via the magnetoelastic effect.

Purpose of the Study:

  • To experimentally demonstrate the directional motion of Néel-type magnetic skyrmions using surface acoustic waves (SAWs).
  • To investigate the influence of different SAW types on skyrmion dynamics.
  • To explore acoustic wave-driven skyrmion manipulation for ultra-low power spintronics.

Main Methods:

  • Fabrication of on-chip piezoelectric transducers to generate propagating SAW pulses.
  • Experimental observation of Néel-type skyrmion motion in Ta/CoFeB/MgO/Ta multilayers.
  • Micromagnetic simulations to confirm observed skyrmion dynamics.

Main Results:

  • Shear horizontal SAWs were found to effectively drive the directional motion of skyrmions.
  • SAWs with longitudinal and shear vertical displacements (Rayleigh waves) did not induce skyrmion motion.
  • Both longitudinal motion along the SAW propagation direction and transverse motion due to topological charge were observed.

Conclusions:

  • Acoustic waves, specifically shear horizontal SAWs, provide an effective method for manipulating magnetic skyrmions.
  • This acoustic manipulation approach offers a promising route for developing ultra-low power skyrmionic devices.
  • The findings open new avenues for utilizing elastic waves in spintronic applications.