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{Coherent excitation of heterosymmetric spin waves with ultrashort wavelengths}

2019

Article

mms


In the emerging field of magnonics, spin waves are foreseen as signal carriers for future spintronic information processing and communication devices, owing to both the very low power losses and a high device miniaturization potential predicted for short-wavelength spin waves. Yet, the efficient excitation and controlled propagation of nanoscale spin waves remains a severe challenge. Here, we report the observation of high-amplitude, ultrashort dipole-exchange spin waves (down to 80 nm wavelength at 10 GHz frequency) in a ferromagnetic single layer system, coherently excited by the driven dynamics of a spin vortex core. We used time-resolved x-ray microscopy to directly image such propagating spin waves and their excitation over a wide range of frequencies. By further analysis, we found that these waves exhibit a heterosymmetric mode profile, involving regions with anti-Larmor precession sense and purely linear magnetic oscillation. In particular, this mode profile consists of dynamic vortices with laterally alternating helicity, leading to a partial magnetic flux closure over the film thickness, which is explained by a strong and unexpected mode hybridization. This spin-wave phenomenon observed is a general effect inherent to the dynamics of sufficiently thick ferromagnetic single layer films, independent of the specific excitation method employed.

Author(s): Dieterle, G. and Förster, J. and Stoll, H. and Semisalova, A. S. and Finizio, S. and Gangwar, A. and Weigand, M. and Noske, M. and Fähnle, M. and Bykova, I. and Gräfe, J. and Bozhko, D. A. and Musiienko-Shmarova, H. Yu. and Tiberkevich, V. and Slavin, A. N. and Back, C. H. and Raabe, J. and Schütz, G. and Wintz, S.
Journal: {Physical Review Letters}
Volume: 122
Number (issue): 11
Year: 2019
Publisher: American Physical Society

Department(s): Modern Magnetic Systems
Bibtex Type: Article (article)

Address: Woodbury, N.Y.
DOI: 10.1103/PhysRevLett.122.117202
Language: eng

BibTex

@article{escidoc:2573432,
  title = {{Coherent excitation of heterosymmetric spin waves with ultrashort wavelengths}},
  author = {Dieterle, G. and F\"orster, J. and Stoll, H. and Semisalova, A. S. and Finizio, S. and Gangwar, A. and Weigand, M. and Noske, M. and F\"ahnle, M. and Bykova, I. and Gr\"afe, J. and Bozhko, D. A. and Musiienko-Shmarova, H. Yu. and Tiberkevich, V. and Slavin, A. N. and Back, C. H. and Raabe, J. and Sch\"utz, G. and Wintz, S.},
  journal = {{Physical Review Letters}},
  volume = {122},
  number = {11},
  publisher = {American Physical Society},
  address = {Woodbury, N.Y.},
  year = {2019}
}