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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Parametric oscillation of magnetization in ferromagnets is achievable via microwave voltage, showing promise for non-volatile memory switching.
  • Historically, microwave voltage-induced modulation of perpendicular magnetic anisotropy was less significant than in-plane magnetic fields.
  • Recent advancements in material science have dramatically enhanced the voltage-controlled magnetic anisotropy (VCMA) effect efficiency.

Purpose of the Study:

  • To numerically investigate magnetization dynamics under a wide range of microwave VCMA effects.
  • To analyze the impact of increased VCMA efficiency on magnetization behavior.
  • To explore the transition from periodic oscillations to complex dynamics.

Main Methods:

  • Numerical solution of the Landau-Lifshitz-Gilbert equation.
  • Analysis of bifurcation diagrams to map magnetization dynamics.
  • Evaluation of local maxima in magnetization dynamics under varying modulation amplitudes.

Main Results:

  • For low modulation amplitudes, periodic parametric oscillation was observed.
  • As the microwave magnetic anisotropy field exceeded the external field, broadened distributions of local maxima appeared.
  • This broadening signifies the emergence of complex dynamics, including chaotic and transient-chaotic behaviors.

Conclusions:

  • The study demonstrates complex magnetization dynamics, including chaos, driven by a strong microwave VCMA effect.
  • This finding highlights the potential for advanced control of magnetization in spintronic devices.
  • The results suggest new pathways for designing high-performance non-volatile memory technologies.