Vortex precession frequency and its amplitude-dependent shift in cylindrical nanomagnets

Frequency of free magnetic vortex precession in circular soft ferromagnetic nano-cylinders (magnetic dots) of various sizes is an important parameter, used in design of spintronic devices (such as spin-torque microwave nano-oscillators) and characterization of magnetic nanostructures. Here, using a...

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Bibliographic Details
Published in:Journal of applied physics 2013-12, Vol.114 (22)
Main Author: Metlov, Konstantin L
Format: Article
Language:English
Subjects:
AMPLITUDES
Applied physics
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CYLINDERS
CYLINDRICAL CONFIGURATION
DESIGN
Design parameters
Ferromagnetism
Frequency shift
Frequency stability
MAGNETS
Mathematical analysis
MICROWAVE RADIATION
NANOSCIENCE AND NANOTECHNOLOGY
NANOSTRUCTURES
Nonlinear dynamics
OSCILLATORS
PRECESSION
STABILITY
TEXTURE
TORQUE
Vortex precession
VORTICES
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Summary:Frequency of free magnetic vortex precession in circular soft ferromagnetic nano-cylinders (magnetic dots) of various sizes is an important parameter, used in design of spintronic devices (such as spin-torque microwave nano-oscillators) and characterization of magnetic nanostructures. Here, using a recently developed collective-variable approach to non-linear dynamics of magnetic textures in planar nano-magnets, this frequency and its amplitude-dependent shift are computed analytically and plotted for the full range of cylinder geometries. The frequency shift is positive in large planar dots, but becomes negative in smaller and more elongated ones. At certain dot dimensions, a zero frequency shift is realized, which can be important for enhancing frequency stability of magnetic nano-oscillators.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4844435