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Researchers demonstrate switchable spin-orbit torque in a Pt/Co/Pt device using ionic gating. A negative electric field significantly enhances spin-orbit torque, paving the way for programmable spintronic devices.

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Area of Science:

  • Spintronics
  • Materials Science
  • Condensed Matter Physics

Background:

  • Spin-orbit torque is a key electric technique for manipulating magnetization in spintronic devices.
  • Developing efficient methods for dynamic magnetization control is crucial for advancing spintronic applications.

Purpose of the Study:

  • To report gate-induced ON-OFF switchable spin-orbit torque in a Pt/Co/Pt device.
  • To investigate the effect of electric gating on spin-orbit torque efficiency.

Main Methods:

  • Utilized an ionic gating technique to apply electric fields to a Pt/Co/Pt spin-orbit device.
  • Manipulated spin currents from Pt layers to achieve an OFF state.
  • Measured the enhancement of damping-like spin-orbit torque under varying gate electric fields.

Main Results:

  • Achieved gate-induced ON-OFF switchability of spin-orbit torque.
  • Demonstrated a sixfold enhancement of damping-like spin-orbit torque under a strong negative gate electric field compared to a positive field.
  • Explained the gate modulation by changes in spin-charge interconversion.

Conclusions:

  • The study successfully demonstrates electrically controllable spin-orbit torque in a Pt/Co/Pt device.
  • Gate modulation of spin-orbit torque is attributed to electric field-induced changes in spin-charge interconversion.
  • This research offers a promising pathway for developing electrically programmable spintronic devices.