  We report differential phase contrast scanning transmission electron
microscopy (TEM) of nanoscale magnetic objects in Kagome ferromagnet
Fe$_3$Sn$_2$ nanostructures. This technique can directly detect the deflection
angle of a focused electron beam, thus allowing clear identification of the
real magnetic structures of two magnetic objects including three-ring and
complex arch-shaped vortices in Fe$_3$Sn$_2$ by Lorentz transmission electron
microscopy imaging. Numerical calculations based on real material-specific
parameters well reproduced the experimental results, showing that the magnetic
objects can be attributed to integral magnetizations of two types of complex
three-dimensional (3D) magnetic skyrmion bubbles with depth-modulated spin
twisting. Magnetic configurations obtained using the high-resolution TEM are
generally considered as two-dimensional (2D) magnetic objects previously. Our
results imply the importance of the integral magnetizations of underestimated
3D magnetic structures in 2D TEM magnetic characterizations.
