Probing magnetic correlations with spin-echo modulated small angle neutron scattering (SEMSANS)

Li, Fankang; Steinke, Nina‐Juliane; Dalgliesh, Robert M.; Washington, A. L.; Shen, Jianzhao; Pynn, R.; Parnell, Steven R.

doi:10.1016/j.nima.2021.165705

Cited by 10 publications

(10 citation statements)

References 33 publications

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“…In particular, it allows monitoring of the domain properties of the RSG samples from the pure ferromagnet up to the strongly frustrated SG regime. Proof-of-principle experiments have indeed shown that the method works on depolarizing samples (Grigoriev et al, 2006;Li et al, 2021). An interesting development would be to make this technique also compatible with high magnetic fields at the sample position, in order to study the field-induced vortex-like defects discussed in Section 6 over an extended parameter range.…”

Section: Discussionmentioning

confidence: 99%

Revisiting neutron studies of reentrant spin glasses: the role of small-angle scattering

Mirebeau

Martín

2022

J Appl Crystallogr

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The application is discussed of neutron methods to the study of reentrant spin glasses (RSGs), close to the transition towards a `canonical' spin glass (SG). The focus is on two emblematic systems, namely Au1−x Fe x and amorphous a-Fe1−x Mn x . A set of experimental results is presented to highlight their peculiar static and dynamic properties. The role of small-angle neutron scattering (SANS) is stressed as an important tool to unravel the structure of these complex systems over mesoscopic length scales. Finally, recent SANS results performed under an applied magnetic field in the region of the RSG → SG transition are presented. They show that vortex-like defects are present in the RSG region up to the critical line and vanish in the SG region. These defects, which develop only in a ferromagnetic medium, could be a key feature to probe the emergence of long-range magnetic order.

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Section: Discussionmentioning

confidence: 99%

Revisiting neutron studies of reentrant spin glasses: the role of small-angle scattering

Mirebeau

Martín

2022

J Appl Crystallogr

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“… 400 SEMSANS, a comparable approach to MIEZE with neutron spin manipulation before the sample, enables the measurement of spatial magnetic correlations with flexible and varying magnetic field configurations. 401 The technique could be beneficial to characterize large MNPs and dense assemblies thereof, including magnetic superstructures, and to study their field-dependent response.…”

Section: Summary and Perspectivesmentioning

confidence: 99%

Using small-angle scattering to guide functional magnetic nanoparticle design

et al. 2022

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“…It is therefore often advantageous to consider cuts of P AE f along certain directions in q space. This might also be of relevance for other spin-manipulating techniques such as SEMSANS, which is a one-dimensional technique that only measures correlations in the encoding direction (Li et al, 2021). However, one has to keep in mind that SEMSANS is a real-space technique that (similar to SESANS and DFI) essentially measures the cosine Fourier transform of the cross section.…”

Section: Sector Averagesmentioning

confidence: 99%

“…The polarized DFI method has great potential for analyzing real-space magnetic correlations on a macroscopic length scale, well beyond what can be probed with a conventional SANS instrument. Similarly, first measurements of micrometre-sized magnetic correlations have been performed with an alternative neutron precession technique called spin-echo modulated small-angle neutron scattering (SEMSANS) (Li et al, 2021). With this setup, the spin manipulations are performed before the sample so that the measurement is not sensitive to large stray fields (related e.g.…”

Section: Introductionmentioning

confidence: 99%

Uniaxial polarization analysis of bulk ferromagnets: theory and first experimental results

Malyeyev¹,

Titov²,

Dewhurst³

et al. 2022

J Appl Cryst

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On the basis of Brown's static equations of micromagnetics, the uniaxial polarization of the scattered neutron beam of a bulk magnetic material is computed. The approach considers a Hamiltonian that takes into account the isotropic exchange interaction, the antisymmetric Dzyaloshinskii–Moriya interaction, magnetic anisotropy, the dipole–dipole interaction and the effect of an applied magnetic field. In the high-field limit, the solutions for the magnetization Fourier components are used to obtain closed-form results for the spin-polarized small-angle neutron scattering (SANS) cross sections and the ensuing polarization. The theoretical expressions are compared with experimental data on a soft magnetic nanocrystalline alloy. The micromagnetic SANS theory provides a general framework for polarized real-space neutron methods, and it may open up a new avenue for magnetic neutron data analysis on magnetic microstructures.

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Probing magnetic correlations with spin-echo modulated small angle neutron scattering (SEMSANS)

Cited by 10 publications

References 33 publications

Revisiting neutron studies of reentrant spin glasses: the role of small-angle scattering

Revisiting neutron studies of reentrant spin glasses: the role of small-angle scattering

Using small-angle scattering to guide functional magnetic nanoparticle design

Uniaxial polarization analysis of bulk ferromagnets: theory and first experimental results

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