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Figure 4
Experimental 2D elastic total (nuclear + magnetic) unpolarized SANS cross section dΣ/dΩ of the HPT + 473 K Fe sample measured at the selected fields of (a) 8 T and (b) 0.2 T. (c) The corresponding purely magnetic SANS cross section dΣmag/dΩ obtained by subtracting the dΣ/dΩ at the (near) saturation field of 8.0 T from the dΣ/dΩ at μ0H0 = 0.2 T. The applied magnetic field H0 is horizontal in the plane of the detector (H0 ⊥ k0) and a logarithmic color scale is used in (a)–(c). (d) Experimental 1D purely magnetic SANS cross section obtained either by an azimuthal average over 2π, or from ±10° sector averages along (θ = 0°) or perpendicular (θ = 90°) to H0 of the dΣmag/dΩ plotted in (c) (log–log scale). (e) Azimuthal angle (θ) dependency of the magnetic scattering intensities obtained from (c). Note that in (a)–(c) dΣ/dΩ and dΣmag/dΩ are plotted in polar coordinates with q (nm−1), θ (°) and intensity (cm−1). The data in (a)–(c) are shown up to q = 0.25 nm−1. The white dashed lines in (c) are a visual guide to highlight the slight elongation of the scattering pattern along the field direction at smaller q.

IUCrJ
Volume 10| Part 4| July 2023| Pages 411-419
ISSN: 2052-2525
https://doi.org/10.1107/S2052252523003937