Energy-filtered Lorentz microscopy (EFLM) combines a post-column energ
y filter with a high-resolution TEM, operated with the main objective
lens switched off. In this paper we use a magnetostrictive material, T
erfenol-D (Tb0.73Dy0.27Fe1.95), to illustrate the benefits of zero-los
s filtering on both standard and coherent Fresnel and Foucault modes.
It is shown that the signal-to-noise ratio of Foucault images is impro
ved by an order of magnitude. We present a detailed study of magnetic
domain configurations in the vicinity of growth twins and show that th
e magnetic resolution of the system is better than 5 nm. Our observati
ons compare favorably with micromagnetic models. We also show that mag
netic induction mapping becomes a viable technique in thicker regions
when the inelastically scattered electrons have been removed from the
images. Finally, we present simulations of Fresnel and Foucault images
, assuming two-dimensional periodic boundary conditions for the comput
ation of the Aharonov-Bohm phase shift.