Figure 5.

Bandgap diagram with respect toM/afor longitudinally magnetized MCWs. With a (=M + N) = 20 nm for (a) MFe/NNi, (b) MFe/NPy, (c) MPy/NNi, (d) MCo/NNi, (e) MCo/NPy, and (f) MCo/NFe MCWs under applied field H = 600 mT. The gray regions represent the allowed bands, while the red, green, and blue regions, the respective first, second, and third forbidden bands.