Analysis of magnetic neutron-scattering data of two-phase ferromagnets

Honecker, Dirk; Dewhurst, C. D.; Suzuki, Kiyonori; Erokhin, Sergey; Michels, Andreas

doi:10.1103/physrevb.88.094428

Cited by 21 publications

(33 citation statements)

References 24 publications

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“…6. We note that in nanocrystalline bulk ferromagnets the field dependence of spin-misalignment SANS can be several orders of magnitude between a field close to saturation and the coercive field (Honecker et al, 2011;Bick, Honecker et al, 2013;Honecker et al, 2013).…”

Section: Figurementioning

confidence: 83%

Magnetic field dependent small-angle neutron scattering on a Co nanorod array: evidence for intraparticle spin misalignment

et al. 2014

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The structural and magnetic properties of a cobalt nanorod array have been studied by means of magnetic field dependent small-angle neutron scattering (SANS). Measurement of the unpolarized SANS cross section dAE/d of the saturated sample in the two scattering geometries where the applied magnetic field H is either perpendicular or parallel to the wavevector k i of the incoming neutron beam allows one to separate nuclear from magnetic SANS, without employing the usual sector-averaging procedure. The analysis of the SANS data in the saturated state provides structural parameters (rod radius and centre-tocentre distance) that are in good agreement with results from electron microscopy. Between saturation and the coercive field, a strong field dependence of dAE/d is observed (in both geometries), which cannot be explained using the conventional expression of the magnetic SANS cross section of magnetic nanoparticles in a homogeneous nonmagnetic matrix. The origin of the strong field dependence of dAE/d is believed to be related to intradomain spin misalignment, due to magnetocrystalline and magnetoelastic anisotropies and magnetostatic stray fields.

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Section: Figurementioning

confidence: 83%

Magnetic field dependent small-angle neutron scattering on a Co nanorod array: evidence for intraparticle spin misalignment

et al. 2014

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“…To describe the scenario shown in Figure 1c, an analytical theory for

I_{m} (q)

was developed by Honecker and Michels, [ 51,52 ] which is valid in the approach to saturation (see Equation ()). Figure a displays the calculated 2D patterns using this model for the field strengths of 321, 163, 85, and 45 mT, and in Figure 2b we plot the corresponding 2D correlation functions that we extracted from the synthetic scattering data using the Kaczmarz algorithm (see Equation ()).…”

Section: Resultsmentioning

confidence: 99%

“…a) Theoretical 2D SANS patterns

I_{normalm} (q)

calculated for the four field strengths μ 0 H = 321, 163, 85, 45 mT, using the same model and material parameters as in Honecker et al [ 51 ] The Fe crystallites are assumed to be well‐separated spheres and lognormally distributed with a mean size of 10 nm and

σ = 0.2

. The plotted q range is

0.1 - 0.4 {nm}^{- 1}

, but the total q range we used for the calculations was

0.1 - 1.2 {nm}^{- 1}

.…”

Section: Resultsmentioning

confidence: 99%

“…Micromagnetic Simulation: The magnetic nanostructure of Nanoperm was simulated with MuMax3, [50] using the material parameters for Nanoperm from Honecker et al [51] Kaczmarz Algorithm: The python scripts used to extract the 2D correlation functions from the SANS patterns can be found in the GitHub repository (https://github.com/PBenderLux/Data-analysis).…”

Section: Methodsmentioning

confidence: 99%

“…The magnetic nanostructure of Nanoperm was simulated with MuMax3, [ 50 ] using the material parameters for Nanoperm from Honecker et al [ 51 ]…”

Section: Methodsmentioning

confidence: 99%

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Unraveling Nanostructured Spin Textures in Bulk Magnets

et al. 2020

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One of the key challenges in magnetism remains the determination of the nanoscopic magnetization profile within the volume of thick samples, such as permanent ferromagnets. Thanks to the large penetration depth of neutrons, magnetic small‐angle neutron scattering (SANS) is a powerful technique to characterize bulk samples. The major challenge regarding magnetic SANS is accessing the real‐space magnetization vector field from the reciprocal scattering data. In this study, a fast iterative algorithm is introduced that allows one to extract the underlying 2D magnetic correlation functions from the scattering patterns. This approach is used here to analyze the magnetic microstructure of Nanoperm, a nanocrystalline alloy which is widely used in power electronics due to its extraordinary soft magnetic properties. It can be shown that the computed correlation functions clearly reflect the projection of the 3D magnetization vector field onto the detector plane, which demonstrates that the used methodology can be applied to probe directly spin textures within bulk samples with nanometer resolution.

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Unraveling Nanostructured Spin Textures in Bulk Magnets

et al. 2021

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Magnetic Microstructures One of the key challenges in magnetism remains the determination of the nanoscopic magnetization profile within thick bulk samples. In article number http://doi.wiley.com/10.1002/smsc.202000003, Philipp Bender and co‐workers present a novel approach to extract the two‐dimensional magnetic correlation functions from magnetic small‐angle neutron scattering data. This methodology is applied here to probe directly, with nanometer resolution, the spin‐textures within a nanostructured ferromagnet.

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Analysis of magnetic neutron-scattering data of two-phase ferromagnets

Cited by 21 publications

References 24 publications

Magnetic field dependent small-angle neutron scattering on a Co nanorod array: evidence for intraparticle spin misalignment

Magnetic field dependent small-angle neutron scattering on a Co nanorod array: evidence for intraparticle spin misalignment

Unraveling Nanostructured Spin Textures in Bulk Magnets

Unraveling Nanostructured Spin Textures in Bulk Magnets

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