(color online) Experimental EMCD signals of Fe element in YIG under different diffraction conditions. (a) and (b) are the EMCD signals from two-beam and three-beam cases, respectively. (c) and (d) are the EMCD signals with the octahedral and tetrahedral Fe enhanced under the incident angle of , respectively. The schematic drawings in each figure briefly show the diffraction geometry and the blue circles represent the positions of entrance aperture (from Ref. [26], Fig. 3).