Figure 3.

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