Fig. 4: EMCD measurement in different regions.

a–c The EMCD spectra (blue lines) are acquired at the perfect region, and positions corresponding to a ~2–3 nm distance from the interfaces of APB-I and APB-II, respectively. The EEL spectra recorded from the conjugated positions labeled as positive red circles and negative black circles are normalized. Then, the EMCD spectra (blue lines) can be obtained through subtraction between the positive and negative spectra (red and black lines).