Coherent excitation of heterosymmetric spin waves with ultrashort wavelengths
Coherent excitation of heterosymmetric spin waves with ultrashort wavelengths
Dieterle, G.; Förster, J.; Stoll, H.; Semisalova, A. S.; Finizio, S.; Gangwar, A.; Weigand, M.; Noske, M.; Fähnle, M.; Bykova, I.; Bozhko, D. A.; Musiienko-Shmarova, H. Y.; Tiberkevich, V.; Slavin, A. N.; Back, C. H.; Raabe, J.; Schütz, G.; Wintz, S.
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 miniaturisation potential predicted for short-wavelength spin waves. Yet, the controlled and efficient excitation of propagating nanoscale spin waves remains a challenge to be resolved. 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 for a wide range of excitation 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 hybridisation. The 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.
Keywords: spin wave vortex x-ray microscopy
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- Ion Beam Center DOI: 10.17815/jlsrf-3-159
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- DOI: 10.17815/jlsrf-3-159 is cited by this (Id 26429) publication
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Physical Review Letters 122(2019), 117202
DOI: 10.1103/PhysRevLett.122.117202
Cited 72 times in Scopus -
Lecture (Conference)
Intermag 2018, 23.-27.04.2018, Singapur, Singapur -
Lecture (Conference)
International Conference on Magnetism, 15.-20.07.2018, San Francisco, USA -
Lecture (Conference)
23rd International Colloquium on Magnetic Films and Surfaces, 22.-27.07.2018, Santa Cruz, USA -
Lecture (Conference)
9th Joint European Magnetic Symposia, 03.-07.09.2018, Mainz, Germany -
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arXiv:1712.00681v3 [cond-mat.mes-hall]: https://arxiv.org/abs/1712.00681 -
Lecture (Conference)
Magnonics 2019, 28.07.-01.08.2019, Carovigno, Italien
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