Role of symmetry in quantitative EMCD experiments

We have analysed a number of experimental geometries (two and three-beam geometry, general systematic row setup, zone axis orientation) for the electron magnetic circular dichroism measurements (EMCD). The effect of asymmetries in those setups is described in detail, explaining the advantages of the three-beam geometry. We observe a complicated thickness and orientation dependence of the dichroic signal and asymmetries. Therefore we stress the importance of the simulations, which should accompany the EMCD experiments.