Figure 11
Envelope lines of the double helices corresponding to the magnetic moments in the two layers Fe and Dy (shown inside the layer structures).
The red and the black lines correspond to the Dy and Fe layer moments, respectively. The discontinuity of the red/black curve at the interface for −2.5 kOe, is a signature of the twist in the helix at the interface. At −10 kOe, no such discontinuity exists, which a signature of continuity of the helical structure across the interface. The schematics of the helical configuration with intuitive chirality are also shown alongside. The periodicity of the spin wave vector q is doubled with an increase in field. Also shown are the resulting envelope due to the superposition of the two spin waves (shown alongside the layer structures). The two strands of the superimposed lines (blue and the green lines) are representatives of standing wave-like formations corresponding to the two fields.
