Left-Handed Spin Wave Excitation in Ferromagnet

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  • Onoda Masaru
    Correlated Electron Research Center (CERC), National Institute of Advanced Industrial Science and Technology (AIST) CREST, Japan Science and Technology Agency (JST)
  • Mishchenko Andrei S.
    Correlated Electron Research Center (CERC), National Institute of Advanced Industrial Science and Technology (AIST) CREST, Japan Science and Technology Agency (JST)
  • Nagaosa Naoto
    Correlated Electron Research Center (CERC), National Institute of Advanced Industrial Science and Technology (AIST) Department of Applied Physics, University of Tokyo CREST, Japan Science and Technology Agency (JST)

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Abstract

The spin wave dynamics in metallic ferromagnet is studied theoretically taking into account the relativistic spin–orbit interaction. It is found that its quantum dynamics is seriously influenced by the band crossings near the Fermi energy, and sometimes the direction of the precession, i.e., the handedness, can be reversed from that expected from the commutation relation of the spin components. Namely, the left-handed spin wave excitation can be realized in systems with the spin–orbit interaction.

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