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Magnetic domain wall motion driven by an acoustic wave.

Evgeny Vilkov1, Oleg Byshevski-Konopko1, Pavel Stremoukhov2

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Acoustic shear waves can control magnetic domain wall motion, reaching near-supersonic speeds due to resonance. Nonlinear interactions reveal complex dynamics in magnet-acoustic systems.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Acoustics and Magnetism

Background:

  • Magnet-based information technologies promise low-loss data storage.
  • Domain walls (DW) are crucial for manipulating magnetic information.
  • Controlling DW motion with external stimuli is key for device applications.

Purpose of the Study:

  • To investigate the control of domain wall motion using acoustic shear waves.
  • To explore the influence of acoustic wave parameters on DW dynamics.
  • To understand the nonlinear interactions between acoustic and magnetic systems.

Main Methods:

  • Generation and propagation of acoustic shear waves.
  • Observation and measurement of domain wall motion under acoustic excitation.
  • Analysis of wave-vector, frequency, and amplitude dependencies.
  • Characterization of nonlinear phenomena in the coupled system.

Main Results:

  • Acoustic shear waves can effectively drive domain wall motion.
  • DW velocities can reach a significant fraction of the speed of sound under specific resonance conditions.
  • Resonance occurs due to wave reflection, dependent on frequency, angle, and amplitude.
  • Strong nonlinearities observed, including negative slope in reflection peaks and s-shaped DW velocity dependence.

Conclusions:

  • Acoustic shear waves offer a viable method for controlling domain wall dynamics.
  • Resonance phenomena significantly enhance the efficiency of acoustic control.
  • Nonlinear magnet-acoustic interactions are critical for understanding and exploiting these effects.