Role of higher-order effects in spin-misalignment small-angle neutron scattering of high-pressure torsion nickel

Y. Oba, M. Bersweiler, I. Titov, N. Adachi, Y. Todaka, E. P. Gilbert, N.-J. Steinke, K. L. Metlov, and A. Michels
Phys. Rev. Materials 5, 084410 – Published 24 August 2021

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 sin2θ-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.

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  • Received 14 May 2021
  • Accepted 4 August 2021

DOI:https://doi.org/10.1103/PhysRevMaterials.5.084410

©2021 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Y. Oba1,2,*, M. Bersweiler2, I. Titov2, N. Adachi3, Y. Todaka3, E. P. Gilbert4, N.-J. Steinke5, K. L. Metlov6, and A. Michels2

  • 1Materials Sciences Research Center, Japan Atomic Energy Agency, 2-4 Shirakata, Tokai, Ibaraki, 319-1195, Japan
  • 2Department of Physics and Materials Science, University of Luxembourg, 162A Avenue de la Faïencerie, L-1511 Luxembourg, Grand Duchy of Luxembourg
  • 3Department of Mechanical Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku, Toyohashi, Aichi 441-8580, Japan
  • 4Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia
  • 5Institute Laue-Langevin, 71 Avenue des Martyrs, F-38042 Grenoble, France
  • 6Donetsk Institute for Physics and Technology, R. Luxembourg Street 72, 83114 Donetsk, Ukraine and Institute for Numerical Mathematics RAS, 8 Gubkina Street, 119991 Moscow GSP-1, Russia

  • *ohba.yojiro@jaea.go.jp

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Issue

Vol. 5, Iss. 8 — August 2021

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