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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Spin-orbit interaction phenomena, like the spin Hall and Rashba effects, are crucial for efficient magnetization manipulation in ferromagnetic/heavy metal bilayers using electric currents.
  • The precise underlying mechanisms driving these spin-orbit interaction phenomena remain incompletely understood.
  • Understanding these mechanisms is vital for advancing spintronics and developing novel magnetic memory and logic devices.

Purpose of the Study:

  • To develop a sensitive spin-orbit torque magnetometer utilizing the magneto-optic Kerr effect.
  • To quantitatively measure spin-orbit torque vectors in cobalt iron boron/platinum bilayers across a broad thickness range.
  • To elucidate the dominant mechanisms responsible for spin-orbit interaction-driven phenomena in these heterostructures.

Main Methods:

  • Fabrication of cobalt iron boron/platinum bilayers with varying layer thicknesses.
  • Utilized a sensitive magnetometer based on the magneto-optic Kerr effect to measure spin-orbit torque vectors.
  • Performed thickness-dependence studies, including the insertion of a copper layer at the interface, to differentiate interfacial and bulk contributions.

Main Results:

  • The Slonczewski-like torque was observed to be inversely proportional to the ferromagnet layer thickness.
  • A threshold effect was identified for the field-like torque, appearing only when the ferromagnetic layer thickness was below 1 nm.
  • Analysis indicated that the spin Hall effect is the primary mechanism, with a secondary interface contribution potentially arising from the Rashba effect.

Conclusions:

  • The spin Hall effect is identified as the dominant mechanism for spin-orbit interaction-driven phenomena in CoFeB/Pt bilayers.
  • A distinct interfacial contribution, possibly attributed to the Rashba effect, also plays a role.
  • The developed magnetometer provides a sensitive tool for characterizing spin-orbit torques and advancing the understanding of spintronic phenomena.