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|May 30, 2020
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Researchers demonstrated controllable spin torques using the planar Hall effect in a Cobalt-Nickel (CoNi) multilayer. This spintronic effect shows potential for efficient charge-to-spin current conversion, comparable to the spin Hall effect.

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Area of Science:

  • Spintronics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Converting charge current to spin current is crucial for spintronic devices.
  • Controlled spin polarization is needed to exert torques on magnetic layers.
  • Existing methods like the spin Hall effect have limitations.

Purpose of the Study:

  • To demonstrate controllable spin torques in a two-ferromagnet system.
  • To investigate the potential of the planar Hall effect as a spin current source.
  • To compare the efficiency of the planar Hall effect with the spin Hall effect.

Main Methods:

  • Fabrication of a CoNi/Au/CoFeB multilayer structure.
  • Utilizing spin torque ferromagnetic resonance (ST-FMR) to measure torques.
  • Analyzing the response as a function of applied field angle and current.

Main Results:

  • Demonstrated spin torques on a CoFeB layer originating from a CoNi spin current source.
  • Observed response consistent with the symmetry of the planar Hall effect in CoNi.
  • Found the planar Hall effect's strength to be comparable to the spin Hall effect in platinum.

Conclusions:

  • The planar Hall effect in CoNi effectively generates controllable spin torques.
  • This effect offers a promising alternative for charge-to-spin current conversion in spintronics.
  • Controllable polarization direction makes the planar Hall effect a viable spin current source.