Dynamic susceptibility of concentric permalloy rings with opposite chirality vortices

Abstract

The high frequency dynamic behaviour of concentric permalloy nanorings with vortex domain structures with a thickness of 20 nm, a width in the range of 100 nm-250 nm, and a separation in the range of 10 nm-600 nm is investigated by micromagnetic simulations. The aim is to explore the ferromagnetic resonance of the concentric ring structure as a function of geometric parameters of the system. The dynamic susceptibility spectrum and spatial localization of the ferromagnetic resonance mode are investigated for varying ring widths and separations. The frequency of oscillation is significantly impacted by the presence of the magnetostatic interaction between each ring and can be modulated by a variation in the ring width and separation. The spatial localization of the uniform mode is found to vary as a function of ring separation, which corresponds to a large variation in amplitude of the real and imaginary components of the dynamic susceptibility.

Micromagnetic simulation of dynamic magnetic susceptibility and magnetostatic interaction fields of conical-shaped barium ferrite nanodot arrays

“…Studying the magnetization dynamics is of significance both from the fundamental perspective and the industrial application point of view. The dynamic susceptibility spectrum is one of the magnetization dynamic properties that relates to the resonance frequency of the spin precession under the applied field [3][4][5]. Many analytical, numerical, and experimental works have been carried out to investigate the dynamic susceptibility in different magn etic structures, such as strips, disks, nanowires, nanorings, nanopillars, particles, antidots, and films [6][7][8][9][10].…”

Dynamic and static properties of stadium-shaped antidot arrays

“…This technique probes the magnetization dynamics of the samples using microwave fields whose maximum absorption occurs when the microwave frequency matches the frequency of the resonance modes of the system 42 . A central quantity of the ferromagnetic resonance is the dynamic magnetic susceptibility, which can be obtained by micromagnetic simulations [43][44][45][46][47][48][49][50][51][52] . Numerical studies on the dynamic susceptibility of antidot arrays have shown that by modifying the hole density or hole geometry, it is possible to achieve a reasonable degree of control over the number of resonant peaks, their amplitude and their position 53,54 .…”