Coherent Excitation of Heterosymmetric Spin Waves with Ultrashort Wavelengths

被引:88
作者
Dieterle, G. [1 ]
Foerster, J. [1 ]
Stoll, H. [1 ,2 ,11 ]
Semisalova, A. S. [3 ]
Finizio, S. [4 ]
Gangwar, A. [5 ]
Weigand, M. [1 ,8 ]
Noske, M. [1 ]
Faehnle, M. [1 ]
Bykova, I [1 ]
Graefe, J. [1 ]
Bozhko, D. A. [6 ,9 ]
Musiienko-Shmarova, H. Yu [6 ]
Tiberkevich, V [7 ]
Slavin, A. N. [7 ]
Back, C. H. [5 ,10 ]
Raabe, J. [4 ]
Schuetz, G. [1 ]
Wintz, S. [3 ,4 ]
机构
[1] Max Planck Inst Intelligente Syst, D-70569 Stuttgart, Germany
[2] Johannes Gutenberg Univ Mainz, D-55128 Mainz, Germany
[3] Helmholtz Zentrum Dresden Rossendorf, D-01328 Dresden, Germany
[4] Paul Scherrer Inst, CH-5232 Villigen, Switzerland
[5] Univ Regensburg, D-93053 Regensburg, Germany
[6] Tech Univ Kaiserslautern, D-67663 Kaiserslautern, Germany
[7] Oakland Univ, Rochester, MI 48309 USA
[8] Helmholtz Zentrum Berlin Mat & Energie, D-12489 Berlin, Germany
[9] Glasgow Univ, Glasgow G12 8LT, Lanark, Scotland
[10] Tech Univ Munich, D-85748 Munich, Germany
[11] Univ Duisburg Essen, D-47057 Duisburg, Germany
基金
欧盟地平线“2020”; 美国国家科学基金会;
关键词
BRILLOUIN LIGHT-SCATTERING; MAGNETIC VORTEX CORES; FERROMAGNET; MOTION;
D O I
10.1103/PhysRevLett.122.117202
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
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.
引用
收藏
页数:8
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