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Current-driven resonances in magnetic multilayers.

M Tsoi1, V Tsoi, J Bass

  • 1Grenoble High Magnetic Field Laboratory, Max-Planck-Institut für Festkörperforschung and Centre National de la Recherche Scientifique, BP 166, France.

Physical Review Letters
|December 18, 2002
PubMed
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We observed complex resistance changes in Cobalt/Copper multilayers due to high current densities. These changes are linked to current-induced spin waves interacting with lattice vibrations and phonon excitations.

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Multilayered magnetic materials like Cobalt/Copper (Co/Cu) exhibit complex phenomena.
  • Current-induced spin waves are a key area of spintronic research.

Purpose of the Study:

  • To investigate the complex resistance variations in Co/Cu multilayers under high direct current (dc) densities.
  • To understand the underlying physical mechanisms driving these resistance changes.

Main Methods:

  • Utilized a point contact to inject adjustable dc current densities (approximately 10^9 A/cm^2) into Co/Cu multilayer.
  • Analyzed resistance variations as a function of applied current and magnetic field.

Main Results:

  • Observed complex and structured variations in the electrical resistance.

Related Experiment Videos

  • Attributed these variations to the coupling between current-induced spin waves and lattice vibrations.
  • Identified current-driven resonant excitations of phonons as a significant factor.

    • Conclusions:

    • The study reveals a novel interplay between spin waves, phonons, and electrical resistance in magnetic multilayers.
    • A proposed model explains the observed current and magnetic field dependencies of the resistance variations.