  Magnetic skyrmion, a topological magnetic domain with complex non-coplanar
spin texture, appears a disk-like structure in two dimensions. Exploring
three-dimensional spin texture and related chirality switching has drawn
enormous interests from the perspective of fundamental research. Here, the
three-dimensional magnetic moment of the skyrmion bubbles in centrosymmetric
Mn-Ni-Ga were reconstructed with the vector field tomography approach via
Lorentz transmission electron microscopy. The type of the bubbles was
determined from investigating the magnetic vectors in entire space. We found
that the bubbles switched their chirality easily but still keep the polarity to
remain the singularity of the bubbles within the material. Our results offer
valuable insights into the fundamental mechanisms underlying the spin chirality
flips dynamics of skyrmion bubbles.
