Size-dependent magnetization dynamics in individual Ni80Fe20 disk using micro-focused Brillouin Light Scattering spectroscopy | Zendy

G. Shimon | Zendy; A. O. Adeyeye | Zendy

Open Access

Size-dependent magnetization dynamics in individual Ni80Fe20 disk using micro-focused Brillouin Light Scattering spectroscopy

Author(s) -

G. Shimon,

A. O. Adeyeye

Publication year - 2015

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4930836

Subject(s) - vortex state , magnetization , materials science , brillouin zone , radius , condensed matter physics , spectroscopy , micromagnetics , magnetization dynamics , brillouin spectroscopy , scattering , single domain , aspect ratio (aeronautics) , brillouin scattering , vortex , resonance (particle physics) , domain wall (magnetism) , optics , magnetic field , magnetic domain , physics , atomic physics , optoelectronics , superconductivity , computer security , quantum mechanics , computer science , thermodynamics , optical fiber

A direct and systematic investigation of the magnetization dynamics in individual circular Ni80Fe20 disk of diameter (D) in the range from 300 nm to 1 μm measured using micro-focused Brillouin Light Scattering (μ-BLS) spectroscopy is presented. At high field, when the disks are in a single domain state, the resonance frequency of the uniform center mode is observed to reduce with reducing disk’s diameter. For D = 300 nm, additional edge and end-domains resonant modes are observed due to size effects. At low field, when the disks are in a vortex state, a systematic increase of resonant frequency of magnetostatic modes in a vortex state with the square root of the disks’ aspect ratio (thickness divided by radius) is observed. Such dependence diminishes for disks with larger aspect ratio due to an increasing exchange energy contribution. Micromagnetic simulations are in excellent agreement with the experiments

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