The influence of spin-misalignment scattering on the SANS data evaluation of martensitic age-hardening steels

Bischof, Michael; Staron, Peter; Michels, Andreas; Granitzer, Petra; Rumpf, Klemens; Leitner, Harald; Scheu, Christina; Clemens, Helmut

doi:10.1016/j.actamat.2006.12.004

Cited by 30 publications

(41 citation statements)

References 20 publications

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“…Recent examples include spin-polarized scanning tunneling microscopy 3 , which has been employed to observe and manipulate skyrmions in ultra-thin films 5–7 , or electron holography, which has been used to investigate the temperature and magnetic-field dependence of the magnetic moments of individual skyrmions 8 , or to show that the structure of a vortex state can be adjusted by varying the aspect ratio of single-crystal hcp Co nanowires 9 . Small-angle neutron scattering (SANS) has also been recognized as a powerful technique for studying nanostructured magnetic materials; for instance, SANS is crucial for studying the skyrmion lattice in MnSi 10,11 , ferromagnetic nanorod and nanowire arrays 12–17 , magnetic nanoparticles 18–21 , bulk magnets including magnetic steels 22–26 , or the magnetic microstructure of nanocrystalline Nd-Fe-B magnets 27–29 . Indeed, due to the magnetic sensitivity and the high transparency of neutrons to matter, SANS provides nanometer-scale (~1–100 nm) information from within the bulk of a sample; these properties render SANS complementary to other observational experimental techniques which probe the local surface rather than the bulk structure.…”

Section: Introductionmentioning

confidence: 99%

Small-angle neutron scattering modeling of spin disorder in nanoparticles

Vivas

Yanes

Michels

2017

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Magnetic small-angle neutron scattering (SANS) is a powerful technique for investigating magnetic nanoparticle assemblies in nonmagnetic matrices. For such microstructures, the standard theory of magnetic SANS assumes uniformly magnetized nanoparticles (macrospin model). However, there exist many experimental and theoretical studies which suggest that this assumption is violated: deviations from ellipsoidal particle shape, crystalline defects, or the interplay between various magnetic interactions (exchange, magnetic anisotropy, magnetostatics, external field) may lead to nonuniform spin structures. Therefore, a theoretical framework of magnetic SANS of nanoparticles needs to be developed. Here, we report numerical micromagnetic simulations of the static spin structure and related unpolarized magnetic SANS of a single cobalt nanorod. While in the saturated state the magnetic SANS cross section is (as expected) determined by the particle form factor, significant deviations appear for nonsaturated states; specifically, at remanence, domain-wall and vortex states emerge which result in a magnetic SANS signal that is composed of all three magnetization Fourier components, giving rise to a complex angular anisotropy on a two-dimensional detector. The strength of the micromagnetic simulation methodology is the possibility to decompose the cross section into the individual Fourier components, which allows one to draw important conclusions regarding the fundamentals of magnetic SANS.

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Section: Introductionmentioning

confidence: 99%

Small-angle neutron scattering modeling of spin disorder in nanoparticles

Vivas

Yanes

Michels

2017

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“…(1)). Therefore, when H 0 is not large enough to sufficiently suppress the spin-misaligned SANS, the determined nuclear SANS may contain a significant "contamination" due to magnetic scattering [21]. For Nd-Fe-B magnets, SANS measurements above the Curie temperature may provide a means to determine the nuclear scattering.…”

Section: Figmentioning

confidence: 99%

Magnetic SANS study of a sintered Nd–Fe–B magnet: Estimation of defect size

2015

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“…Numerous studies have utilized SANS and complementary measurements such as TEM, positron annihilation spectroscopy [56] or APT [54,57] to provide detailed quantitative characterization of nanoscale solute clusters in steels. A recent SANS study has found that magnetic spin misalignment effects must be considered for detailed quantitative analyses of precipitates in steels [58]. SANS has also been used to study the microstructure in oxide-dispersion-strengthened (ODS) steel [59], which exhibits a dramatic improvement in thermal creep strength compared to conventional steels.…”

Section: Neutron Scatteringmentioning

confidence: 99%