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Magneto Acoustic Spin Hall Oscillators.

Mustafa Mert Torunbalci1, Tanay Arun Gosavi2, Kerem Yunus Camsari3

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This study presents a novel magneto acoustic spin Hall (MASH) oscillator, merging tunable spin Hall nano oscillators with high-quality factor acoustic resonators. This integration enhances oscillator performance for advanced spintronic devices.

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Area of Science:

  • Spintronics and Microelectromechanical Systems (MEMS)

Background:

  • Spin Hall-driven nano oscillators offer tunability, while high overtone bulk acoustic wave resonators (HBAR) provide high quality factors (Q).
  • Integrating these on a single chip requires addressing feedback mechanisms and device modeling.

Purpose of the Study:

  • To introduce and model a novel magneto acoustic spin Hall (MASH) oscillator.
  • To combine the tunability of spin-orbit torque (SOT) nano oscillators with the high Q of HBARs on a single chip.
  • To explore feedback mechanisms (strain, current, magnetic field) for enhanced oscillator performance.

Main Methods:

  • Development of a SPICE-based circuit model integrating experimentally validated components.
  • Inclusion of the stochastic Landau-Lifshitz-Gilbert (sLLG) equation for magnetization dynamics.
  • Incorporation of the Butterworth Van Dyke (BVD) circuit model for HBARs.

Main Results:

  • Projected ~50X enhancement in oscillator linewidth.
  • Achieved high Q factors up to 52825 at 3 GHz.
  • Demonstrated preserved tunability by locking the spin torque nano oscillator (STNO) to HBAR peaks.

Conclusions:

  • The developed MASH oscillator successfully integrates tunable spintronic elements with high-Q acoustic resonators.
  • The proposed model accurately predicts significant improvements in oscillator linewidth and Q factor.
  • This work paves the way for MEMS-based spintronic devices by synergizing micro- and nano-scale technologies.