Giant moving vortex mass in thick magnetic nanodots.

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.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Guslienko KY,Kakazei GN,Ding J,Liu XM,Adeyeye AO

doi

10.1038/srep13881

subject

Has Abstract

pub_date

2015-09-10 00:00:00

pages

13881

issn

2045-2322

pii

srep13881

journal_volume

5

pub_type

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