Abstract
Skyrmions hold promise for next-generation magnetic storage as their nanoscale dimensions may enable high information storage density and their low threshold for current-driven motion may enable ultra-low energy consumption. Skyrmion-hosting nanowires not only serve as a natural platform for magnetic racetrack memory devices but also stabilize skyrmions. Here we use the topological Hall effect (THE) to study phase stability and current-driven dynamics of skyrmions in MnSi nanowires. THE is observed in an extended magnetic field-temperature window (15–30 K), suggesting stabilization of skyrmions in nanowires compared with the bulk. Furthermore, we show in nanowires that under the high current density of 108–109 A m−2, the THE decreases with increasing current densities, which demonstrates the current-driven motion of skyrmions generating the emergent electric field in the extended skyrmion phase region. These results open up the exploration of skyrmions in nanowires for fundamental physics and magnetic storage technologies.
Highlights
Skyrmions hold promise for next-generation magnetic storage as their nanoscale dimensions may enable high information storage density and their low threshold for current-driven motion may enable ultra-low energy consumption
If the skyrmion domains are to be exploited for magnetic storage applications, emergent electrodynamics study of the current-driven skyrmion motion need to be extended to nanoscale geometries, which allow much higher current densities and potentially higher velocities of the skyrmion motion to be studied[13]
For the first time, we study the electrodynamics of current-driven skyrmions in NW morphology at large current densities and show the suppression of the topological Hall effect (THE) due to the emergent electric field arising from current-driven motion of skyrmions and estimate the skyrmion drift velocity
Summary
Skyrmions hold promise for next-generation magnetic storage as their nanoscale dimensions may enable high information storage density and their low threshold for current-driven motion may enable ultra-low energy consumption. The relative stability and ease of manipulating magnetic skyrmions with the electrical current result from their non-trivial topology, smoothly varying spin configuration and unique ability to deform and avoid pinning sites[2,13] This ultra-low current density may enable low-power consumption applications, and help to avoid common failure modes associated with very large current densities encountered in ferromagnetic systems being explored for magnetic racetrack memory concepts[14]. NW systems can be used to manipulate skyrmions on faster timescales and study the fundamental dynamics of the skyrmions[2,15,16] Skyrmions and their current-driven motion in B20 crystals have been studied by reciprocal space observation using smallangle neutron scattering in bulk crystals of MnSi For the first time, we study the electrodynamics of current-driven skyrmions in NW morphology at large current densities and show the suppression of the THE due to the emergent electric field arising from current-driven motion of skyrmions and estimate the skyrmion drift velocity
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