NuMagSANS: a GPU-accelerated open-source software package for the generic computation of nuclear and magnetic small-angle neutron scattering observables of complex systems

Adams, M.P.; Michels, A.

doi:10.1107/S160057672600258X

Figure 8
Magnetic SANS from a linear vortex magnetization state. (a) Cosine-mode intensities of the spin-flip SANS cross section $[|I^{\rm c}_{{\rm sf},k}(q)|]$ (log–log scale), illustrating the dominant contributions for

and

, which reflect the azimuthal symmetry of the vortex state. Because the linear vortex includes a uniform magnetization component, very small values of q exhibit a pronounced fourfold angular anisotropy, whereas at intermediate and larger q a twofold anisotropy becomes dominant. (b) Two-dimensional chiral SANS cross section $[({\rm d}\Sigma_{\chi}/{\rm d}\Omega)(q_{y},q_{z})]$ , cf. equation (14), showing the expected four-lobe antisymmetric pattern associated with the handedness of the vortex. (c) Spin-flip pair-distance distribution function $[p_{{\rm sf}}(r)]$ , demonstrating the oscillatory real-space correlations induced by the curling magnetization. (d) Two-dimensional real-space correlation function $[C_{{\rm sf}}(r_{y},r_{z})]$ , cf. equation (36), revealing the characteristic positive–negative correlation structure that reflects the axial and azimuthal components of the linear vortex texture.

JOURNAL OF
APPLIED
CRYSTALLOGRAPHY

ISSN: 1600-5767

Volume 59| Part 3| June 2026| Pages 943-959

https://doi.org/10.1107/S160057672600258X

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