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Figure 3
Projection of the experimental geometry onto the yz-plane (see Fig. 2[link]). Shown are the different dominant scattering channels producing π-polarized scattered radiation for left (left panel) and right (right panel) circularly polarized X-rays (see text). For a wavevector transfer leading to the first-order magnetic satellite peaks, i.e. qy = ±τ (2π/τ is the domain periodicity), the X-rays scattered from neighboring spin up or down domains experience a phase shift of ±360°, respectively. Consequently the phase shift between X-rays scattered from adjacent bulk and closure domains is ±90°. The use of circularly polarized X-rays enhances this phase difference to 0 and 180° (for the +τ satellite) and 180 and 0° (for the −τ satellite) which is observable as interference in the scattering signal with a reversal of the X-ray helicity.

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