Theory of spin and lattice wave dynamics excited by focused laser pulses

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Abstract

We develop a theory of spin wave dynamics excited by ultrafast focused laser pulses in a magnetic film. We take into account both the volume and surface spin wave modes in the presence of applied, dipolar and magnetic anisotropy fields and include the dependence on laser spot exposure size and magnetic damping. We show that the sound waves generated by local heating by an ultrafast focused laser pulse can excite a wide spectrum of spin waves (on top of a dominant magnon-phonon contribution). Good agreement with recent experiments supports the validity of the model.

Original languageEnglish
Article number224008
Number of pages8
JournalJournal of Physics D: Applied Physics
Volume51
Issue number22
DOIs
Publication statusPublished - 2018

Keywords

  • magnetoelasticity
  • magnons
  • phonons
  • pump-and-probe
  • spin waves dynamics

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