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Long-living terahertz magnons in ultrathin metallic ferromagnets

Author

Listed:
  • H. J. Qin

    (Max-Planck-Institut für Mikrostrukturphysik)

  • Kh. Zakeri

    (Max-Planck-Institut für Mikrostrukturphysik)

  • A. Ernst

    (Max-Planck-Institut für Mikrostrukturphysik
    Wilhelm Ostwald Institut für Physikalische und Theoretische Chemie, Universität Leipzig)

  • L. M. Sandratskii

    (Max-Planck-Institut für Mikrostrukturphysik)

  • P. Buczek

    (Max-Planck-Institut für Mikrostrukturphysik
    Informatik Consulting Systems AG)

  • A. Marmodoro

    (Max-Planck-Institut für Mikrostrukturphysik)

  • T. -H. Chuang

    (Max-Planck-Institut für Mikrostrukturphysik)

  • Y. Zhang

    (Max-Planck-Institut für Mikrostrukturphysik
    University College London)

  • J. Kirschner

    (Max-Planck-Institut für Mikrostrukturphysik
    Institut für Physik, Martin-Luther-Universität Halle-Wittenberg)

Abstract

The main idea behind magnonics is to use the elementary magnetic excitations (magnons) for information transfer and processing. One of the main challenges, hindering the application of ultrafast terahertz magnons in magnonics, has been the short lifetime of these excitations in metallic ferromagnets. Here, we demonstrate that the engineering of the electronic structure of a ferromagnetic metal, by reducing its dimensionality and changing its chemical composition, opens a possibility to strongly suppress the relaxation channels of terahertz magnons and thereby enhance the magnons’ lifetime. For the first time, we report on the long-lived terahertz magnons excited in ultrathin metallic alloy films. On the basis of the first-principles calculations, we explain the microscopic nature of the long lifetime being a consequence of the peculiar electronic hybridizations of the species. We further demonstrate a way of tailoring magnon energies (frequencies) by varying the chemical composition of the film.

Suggested Citation

  • H. J. Qin & Kh. Zakeri & A. Ernst & L. M. Sandratskii & P. Buczek & A. Marmodoro & T. -H. Chuang & Y. Zhang & J. Kirschner, 2015. "Long-living terahertz magnons in ultrathin metallic ferromagnets," Nature Communications, Nature, vol. 6(1), pages 1-8, May.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms7126
    DOI: 10.1038/ncomms7126
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    Cited by:

    1. G. Poelchen & J. Hellwig & M. Peters & D. Yu. Usachov & K. Kliemt & C. Laubschat & P. M. Echenique & E. V. Chulkov & C. Krellner & S. S. P. Parkin & D. V. Vyalikh & A. Ernst & K. Kummer, 2023. "Long-lived spin waves in a metallic antiferromagnet," Nature Communications, Nature, vol. 14(1), pages 1-8, December.

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