期刊
SCIENTIFIC REPORTS
卷 5, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/srep13881
关键词
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资金
- IKERBASQUE (the Basque Foundation for Science)
- Spanish MINECO grants [FIS2010-20979-C02-01, MAT2013-47078-C2-1-P]
- SMF-NUS New Horizon Awards
- National Research Foundation
- Prime Minister's office, Singapore under its Competitive Research Program (CRP Award) [NRF-CRP 10-2012-03]
- Ministry of Education of Singapore
- Portuguese FCT through the Investigador FCT program
- [EXPL/IF/00981/2013]
Magnetic vortex is one of the simplest topologically non-trivial textures in condensed matter physics. It is the ground state of submicron magnetic elements (dots) of different shapes: cylindrical, square etc. So far, the vast majority of the vortex dynamics studies were focused on thin dots with thickness 5-50 nm and only uniform across the thickness vortex excitation modes were observed. Here we explore the fundamental vortex mode in relatively thick (50-100 nm) dots using broadband ferromagnetic resonance and show that dimensionality increase leads to qualitatively new excitation spectra. We demonstrate that the fundamental mode frequency cannot be explained without introducing a giant vortex mass, which is a result of the vortex distortion due to interaction with spin waves. The vortex mass depends on the system geometry and is non-local because of important role of the dipolar interaction. The mass is rather small for thin dots. However, its importance increases drastically with the dot thickness increasing.
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