Manipulating Spin Chirality of Magnetic Skyrmion Bubbles by In-Plane Re-versed Magnetic Fields in (Mn$_{1-x}$Ni$_x$)$_{65}$Ga$_{35}$ ($x = 0.45$) magnet

TL;DR

This study uses Lorentz TEM to investigate and manipulate the spin chirality of magnetic skyrmion bubbles in MnNiGa, revealing controllable reversal behavior influenced by in-plane magnetic fields and thickness variation, with implications for spintronic devices.

Contribution

It demonstrates the reversible manipulation of skyrmion bubble chirality using in-plane magnetic fields and thickness-dependent symmetry breaking in a centrosymmetric magnet.

Findings

Reversal of skyrmion bubble chirality was achieved with in-plane magnetic fields.

Thickness variation induces controllable symmetry breaking affecting skyrmion behavior.

Micromagnetic simulations revealed non-uniform magnetization dynamics during chirality reversal.

Abstract

Understanding the dynamics of the magnetic skyrmion, a particle-like topologically stable spin texture, and its response dynamics to external fields are indis-pensable for the applications in spintronic devices. In this letter, the Lorentz transmis-sion electron microscopy (LTEM) was used to investigate the spin chirality of the mag-netic skyrmion bubbles (SKBs) in the centrosymmetric magnet MnNiGa at room tem-perature. The reversal of SKBs excited by the in-plane magnetic field has been revealed. Moreover, the collective behavior of interacting spin chirality can be manipulated by reversing the directions of the magnetic fields on a wedge-shaped thin plate. The dy-namic behavior of the bubbles at different position of the thin plate has been explored with the micromagnetic simulation, indicating a non-uniform and nontrivial dynamic magnetization on the surfaces and center of the thin plate during the spin chirality re-versal. The results suggest that the controllable symmetry breaking of the SKBs arising from thickness variation provides an ability to manipulate the collective behavior of the spin chirality with small external fields, leading to a promising application in nonvola-tile spintronic devices for magnetic skyrmions.