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

Understanding the dynamics of the magnetic skyrmion, a particlelike topologically stable spin texture, and its response dynamics to external fields are indispensable for applications in spintronic devices. Here, Lorentz transmission electron microscopy is used to investigate the spin chirality of magnetic skyrmion bubbles (SKBs) in the centrosymmetric magnet (Mn1-xNix)(65)Ga-35 at room temperature. The reversal of SKBs excited by the in-plane magnetic field is 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 dynamic behavior of bubbles at different positions on the thin plate is explored through micromagnetic simulation, which indicates a nonuniform and nontrivial dynamic magnetization on the surfaces and center of the thin plate during spin chirality reversal. The results suggest that the controllable symmetry breaking of the SKBs, arising from thickness variation, provides the ability to manipulate the collective behavior of the spin chirality with small external fields, leading to a promising application in nonvolatile spintronic devices for magnetic skyrmions.