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Spatially and time-resolved magnetization dynamics driven by spin-orbit torques.

Manuel Baumgartner1, Kevin Garello1,2, Johannes Mendil1

  • 1Department of Materials, ETH Zürich, 8093 Zürich, Switzerland.

Nature Nanotechnology
|August 22, 2017
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Summary
This summary is machine-generated.

Spin-orbit torques enable rapid magnetization switching in spintronic devices. Direct observation shows sub-nanosecond switching via domain nucleation and propagation, achieving over 10^12 reversal cycles.

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Area of Science:

  • Spintronics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Current-induced spin-orbit torques are crucial for manipulating magnetization in spintronic devices.
  • These torques offer potential for high-speed, non-volatile memory and logic applications.

Purpose of the Study:

  • To directly observe and characterize spin-orbit-torque-driven magnetization dynamics in Pt/Co/AlOx dots.
  • To elucidate the mechanisms behind ultrafast magnetization switching induced by current pulses.

Main Methods:

  • Utilizing time-resolved X-ray imaging with high spatial (25 nm) and temporal (100 ps) resolution.
  • Investigating magnetization dynamics in Pt/Co/AlOx nanodots under pulsed current injection.

Main Results:

  • Observed magnetization switching within sub-nanosecond current pulses.
  • Identified fast domain nucleation at the dot edge and tilted domain wall propagation as the switching mechanism.
  • Determined deterministic nucleation points influenced by magnetization, current, and external field.
  • Revealed symmetry breaking through combined spin-orbit torques and Dzyaloshinskii-Moriya interaction.

Conclusions:

  • Demonstrated ultrafast and reproducible magnetization switching in Pt/Co/AlOx dots via spin-orbit torques.
  • Established the role of domain nucleation and propagation in sub-nanosecond switching.
  • Showcased the potential for highly durable spintronic devices with over 10^12 reversal cycles.