Abstract
Magnetic nanodots are of high interest for basic research due to their broad spectrum of possible magnetic states and magnetization reversal processes. Besides, they are of technological interest since they can be applied in magnetic data storage, especially if vortex states occur in closed dots or open rings. While producing such nanorings and nanodots from diverse magnetic materials by lithographic techniques is quite common nowadays, these production technologies are naturally prone to small deviations of the borders of these nanoparticles. Here we investigate the influence of well-defined angular-dependent roughness of the edges, created by building the nanoparticles from small cubes, on the resulting hysteresis loops and magnetization reversal processes in five different round nanodots with varying open areas, from a thin ring to a closed nanodot. By varying the orientation of the external magnetic field, the impact of the angle-dependent roughness can be estimated. Especially for the thinnest ring, significant dependence of the transverse magnetization component on the field orientation can be found.
Highlights
Round magnetic nanodots, either closed or ring-like, have been investigated by many research groups
Besides relative ease to produce them reliably with lithographic methods, they are mostly interesting due to the vortex states occurring in dots of diverse dimensions [1,2]
OOMMF is based on solving the Landau-Liftshitz-Gilbert equation [33] and runs on CPU cores, other than mumax3 which works on GPUs [34]
Summary
Either closed or ring-like, have been investigated by many research groups. Vortex states generally have low in-plane stray fields, resulting in small, not fully negligible interactions with neighboring nanodots [3]. The vortex core polarity, pointing up or down, can be used to store data [4]. This is why several research groups investigated possibilities to reverse the vortex polarity [5,6,7,8,9] or possible eigenmodes of vortex precessions [10,11,12]
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