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Generation and detection of phase-coherent current-driven magnons in magnetic multilayers

Author

Listed:
  • M. Tsoi

    (Grenoble High Magnetic Field Laboratory, Max-Planck-Institut für Festkörperforschung and Centre National de la Recherche Scientifique, BP 166)

  • A. G. M. Jansen

    (Grenoble High Magnetic Field Laboratory, Max-Planck-Institut für Festkörperforschung and Centre National de la Recherche Scientifique, BP 166)

  • J. Bass

    (Michigan State University)

  • W.-C. Chiang

    (Michigan State University)

  • V. Tsoi

    (Institute of Solid State Physics RAS)

  • P. Wyder

    (Grenoble High Magnetic Field Laboratory, Max-Planck-Institut für Festkörperforschung and Centre National de la Recherche Scientifique, BP 166)

Abstract

The magnetic state of a ferromagnet can affect the electrical transport properties of the material; for example, the relative orientation of the magnetic moments in magnetic multilayers1 underlies the phenomenon of giant magnetoresistance. The inverse effect—in which a large electrical current density can perturb the magnetic state of a multilayer—has been predicted2,3,4,5,6,7 and observed experimentally with point contacts8,9 and lithographically patterned samples10,11. Some of these observations were taken as indirect evidence for current-induced excitation of spin waves, or ‘magnons’. Here we probe directly the high-frequency behaviour and partial phase coherence of such current-induced excitations, by externally irradiating a point contact with microwaves. We determine the magnon spectrum and investigate how the magnon frequency and amplitude vary with the exciting current. Our observations support the feasibility of a spin-wave maser2 or ‘SWASER’ (spin-wave amplification by stimulated emission of radiation).

Suggested Citation

  • M. Tsoi & A. G. M. Jansen & J. Bass & W.-C. Chiang & V. Tsoi & P. Wyder, 2000. "Generation and detection of phase-coherent current-driven magnons in magnetic multilayers," Nature, Nature, vol. 406(6791), pages 46-48, July.
    • Handle: RePEc:nat:nature:v:406:y:2000:i:6791:d:10.1038_35017512
    DOI: 10.1038/35017512
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