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A Customizable Protocol for String Assembly gRNA Cloning STAgR

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Published on: December 26, 2018

Current-induced dynamics of skyrmion strings.

Tomoyuki Yokouchi¹, Shintaro Hoshino², Naoya Kanazawa¹

¹Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan.

Science Advances

|August 15, 2018

Summary

Magnetic skyrmion strings in chiral magnets exhibit current-induced deformation, leading to unique nonlinear Hall signals. This reveals emergent electromagnetic fields and transport phenomena in noncentrosymmetric systems.

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Area of Science:

Condensed Matter Physics
Spintronics
Topological Matter

Background:

String-like objects are crucial in diverse physical systems.
Magnetic skyrmions are topological spin objects in noncentrosymmetric magnets.
Their current-induced dynamics are of significant research interest.

Purpose of the Study:

Investigate the current-induced deformation dynamics of skyrmion strings.
Analyze the resulting transport response in chiral magnets.
Clarify the mechanism behind nonlinear Hall signals.

Main Methods:

Studied the chiral magnet MnSi.
Observed current-induced deformation dynamics of skyrmion strings.
Utilized a spin density wave picture for skyrmion lattice dynamics.

Main Results:

Skyrmion string deformation dynamics generate transport response linked to the real-space Berry phase.
Prominent nonlinear Hall signals appear above a threshold current in the skyrmion phase.
Asymmetric deformation due to Dzyaloshinskii-Moriya interaction causes nonreciprocal nonlinear Hall response.

Conclusions:

Skyrmion string dynamics in chiral magnets lead to emergent electromagnetic fields.
This results in unique nonlinear transport phenomena.
The study reveals the dynamical nature of topological string-like objects and their transport consequences.