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Title: Giant moving vortex mass in thick magnetic nanodots
Authors: Guslienko K.Y.
Kakazei G.N.
Ding J.
Liu X.M. 
Adeyeye A.O. 
Issue Date: 2015
Publisher: Nature Publishing Group
Citation: Guslienko K.Y., Kakazei G.N., Ding J., Liu X.M., Adeyeye A.O. (2015). Giant moving vortex mass in thick magnetic nanodots. Scientific Reports 5 : 13881. ScholarBank@NUS Repository.
Abstract: 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.
Source Title: Scientific Reports
ISSN: 20452322
DOI: 10.1038/srep13881
Appears in Collections:Staff Publications

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