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Dieterle G, Förster J, Stoll H, Semisalova AS, Finizio S, Gangwar A, Weigand M, Noske M, Fähnle M, Bykova I, Gräfe J, Bozhko DA, Musiienko-Shmarova HY, Tiberkevich V, Slavin AN, Back CH, Raabe J, Schütz G, Wintz S. Coherent Excitation of Heterosymmetric Spin Waves with Ultrashort Wavelengths. Phys Rev Lett 2019; 122:117202. [PMID: 30951356 DOI: 10.1103/physrevlett.122.117202] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2018] [Indexed: 06/09/2023]
Abstract
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.
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Affiliation(s)
- G Dieterle
- Max-Planck-Institut für Intelligente Systeme, 70569 Stuttgart, Germany
| | - J Förster
- Max-Planck-Institut für Intelligente Systeme, 70569 Stuttgart, Germany
| | - H Stoll
- Max-Planck-Institut für Intelligente Systeme, 70569 Stuttgart, Germany
- Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany
| | - A S Semisalova
- Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
| | - S Finizio
- Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
| | - A Gangwar
- Universität Regensburg, 93053 Regensburg, Germany
| | - M Weigand
- Max-Planck-Institut für Intelligente Systeme, 70569 Stuttgart, Germany
| | - M Noske
- Max-Planck-Institut für Intelligente Systeme, 70569 Stuttgart, Germany
| | - M Fähnle
- Max-Planck-Institut für Intelligente Systeme, 70569 Stuttgart, Germany
| | - I Bykova
- Max-Planck-Institut für Intelligente Systeme, 70569 Stuttgart, Germany
| | - J Gräfe
- Max-Planck-Institut für Intelligente Systeme, 70569 Stuttgart, Germany
| | - D A Bozhko
- Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany
| | | | | | - A N Slavin
- Oakland University, Rochester, Michigan 48309, USA
| | - C H Back
- Universität Regensburg, 93053 Regensburg, Germany
| | - J Raabe
- Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
| | - G Schütz
- Max-Planck-Institut für Intelligente Systeme, 70569 Stuttgart, Germany
| | - S Wintz
- Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
- Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
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