Vortex precession frequency and its amplitude-dependent shift in cylindrical nanomagnets
arXiv:1308.0240 · doi:10.1063/1.4844435
Abstract
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.
6 pages, 2 figures
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Cited by in corpus (4)
- Origin of spectral purity and tuning sensitivity in a vortex-based spin transfer nano-oscillator
- An analytical computation of magnetic field generated from a cylinder ferromagnet
- Vortex precession frequency and its amplitude-dependent shift in cylindrical nanomagnets
- Stray magnetic fields from elliptical-shaped and stadium-shaped ferromagnets