  We demonstrate a combination of computational tools and experimental 4D-STEM
methods to image the local magnetic moment in antiferromagnetic Fe$_2$As with 6
angstrom spatial resolution. Our techniques utilize magnetic diffraction peaks,
common in antiferromagnetic materials, to create imaging modes that directly
visualize the magnetic lattice. Using this approach, we show that
center-of-mass analysis can determine the local magnetization component in the
plane perpendicular to the path of the electron beam. Moreover, we develop
Magnstem, a quantum mechanical electron scattering simulation code, to model
electron scattering of an angstrom-scale probe from magnetic materials. Using
these tools, we identify optimal experimental conditions for separating weak
magnetic signals from the much stronger interactions of an angstrom-scale probe
with electrostatic potentials. Our techniques should be useful for
characterizing the local magnetic order in systems such in thin films,
interfaces, and domain boundaries of antiferromagnetic materials, which are
difficult to probe with existing methods.
