Abstract
Magnetic field dependent unpolarized small-angle neutron scattering (SANS) experiments demonstrate that high-pressure torsion (HPT) straining induces spin misalignments in pure Ni, which persist in magnetic fields up to 4 T. The spin-misalignment scattering patterns are elongated perpendicular to the applied magnetic field due to an unusual predominant longitudinal -type angular anisotropy. Such a contribution cannot be explained by the conventional second-order (in spin-misalignment amplitude) micromagnetic SANS theory in the approach-to-saturation regime, nor can its magnitude relative to the other features of the cross sections be explained by the third-order micromagnetic SANS theory. This indicates that the high density of crystal defects induced via HPT straining in Ni makes such higher-order effects in the micromagnetic SANS cross sections observable.
2 More- Received 14 May 2021
- Accepted 4 August 2021
DOI:https://doi.org/10.1103/PhysRevMaterials.5.084410
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