  Elastic scattering of electron vortex beams on magnetic materials leads to a
weak magnetic contrast due to Zeeman interaction of orbital angular momentum of
the beam with magnetic fields in the sample. The magnetic signal manifests
itself as a redistribution of intensity in diffraction patterns due to a change
of sign of the orbital angular moment. While in the atomic resolution regime
the magnetic signal is most likely under the detection limits of present
transmission electron microscopes, for electron probes with high orbital
angular momenta, and correspondingly larger spatial extent, its detection is
predicted to be feasible.
