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

Journal Article · Sat Dec 14 00:00:00 EST 2013 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4844435· OSTI ID:22266154

Metlov, Konstantin L., E-mail: [e-mail] ^[1]

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1. Donetsk Institute for Physics and Technology NAS, Donetsk 83114 (Ukraine)

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.

• OSTI ID: 22266154
• Journal Information: Journal of Applied Physics, Vol. 114, Issue 22; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
77 NANOSCIENCE AND NANOTECHNOLOGY
AMPLITUDES
CYLINDERS
CYLINDRICAL CONFIGURATION
DESIGN
MAGNETS
MICROWAVE RADIATION
NANOSTRUCTURES
OSCILLATORS
PRECESSION
STABILITY
TEXTURE
TORQUE
VORTICES