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Direct observation and imaging of a spin-wave soliton with p-like symmetry.

  • Author(s): Bonetti, S
  • Kukreja, R
  • Chen, Z
  • Macià, F
  • Hernàndez, JM
  • Eklund, A
  • Backes, D
  • Frisch, J
  • Katine, J
  • Malm, G
  • Urazhdin, S
  • Kent, AD
  • Stöhr, J
  • Ohldag, H
  • Dürr, HA
  • et al.

Spin waves, the collective excitations of spins, can emerge as nonlinear solitons at the nanoscale when excited by an electrical current from a nanocontact. These solitons are expected to have essentially cylindrical symmetry (that is, s-like), but no direct experimental observation exists to confirm this picture. Using a high-sensitivity time-resolved magnetic X-ray microscopy with 50 ps temporal resolution and 35 nm spatial resolution, we are able to create a real-space spin-wave movie and observe the emergence of a localized soliton with a nodal line, that is, with p-like symmetry. Micromagnetic simulations explain the measurements and reveal that the symmetry of the soliton can be controlled by magnetic fields. Our results broaden the understanding of spin-wave dynamics at the nanoscale, with implications for the design of magnetic nanodevices.

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