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Peer Reviewed
See detailMagnetic neutron scattering studies on Nd-Fe-B magnets
Michels, Andreas UL

Scientific Conference (2016, August 30)

Detailed reference viewed: 39 (1 UL)
See detailMagnetic neutron scattering studies on Nd-Fe-B magnets (Keynote Lecture)
Michels, Andreas UL

Scientific Conference (2019, June 05)

Detailed reference viewed: 58 (1 UL)
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Peer Reviewed
See detailMagnetic ordering in nanocrystalline gadolinium: A neutron diffraction study
Ryan, D. H.; Michels, Andreas UL; Döbrich, Frank UL et al

in Physical Review. B, Condensed Matter and Materials Physics (2013), 87(064408), 1-6

Detailed reference viewed: 120 (20 UL)
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Peer Reviewed
See detailMagnetic ordering of the martensite phase in Ni-Co-Mn-Sn-based ferromagnetic shape memory alloys
Sarkar, Sudip Kumar; Ahlawat, Sarita; Kaushik, S. D. et al

in Journal of Physics: Condensed Matter (2019)

The magnetic state of low temperature martensite phase in Co-substituted Ni-Mn-Sn-based ferromagnetic shape memory alloys (FSMAs) has been investigated, in view of numerous conflicting reports of ... [more ▼]

The magnetic state of low temperature martensite phase in Co-substituted Ni-Mn-Sn-based ferromagnetic shape memory alloys (FSMAs) has been investigated, in view of numerous conflicting reports of occurrences of spin glass (SG), superparamagnetism (SPM) or long range anti- ferromagnetic (AF) ordering. Combination of dc magnetization, ac susceptibility and small angle neutron scattering (SANS) studies provide a clear evidence for AF order in martensitic phase of Ni45Co5Mn38Sn12 alloy and rule out SPM and SG orders. Identical studies on another alloy of close composition of Ni44Co6Mn40Sn10 point to presence of SG order in martensitic phase and absence of SPM behavior, contrary to earlier report. SANS results do show presence of nanometre-sized clusters but they are found to grow in size from 3 nm at 30 K to 11 nm at 300 K, and do not correlate with magnetism in these alloys. <P /> [less ▲]

Detailed reference viewed: 28 (1 UL)
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Peer Reviewed
See detailMagnetic ordering of the martensite phase in Ni-Co-Mn-Sn-based ferromagnetic shape memory alloys
Sarkar, Sudip Kumar; Ahlawat, Sarita; Kaushik, Som Datta et al

in Journal of Physics: Condensed Matter (2019)

The magnetic state of low temperature martensite phase in Co-substituted Ni-Mn-Sn-based ferromagnetic shape memory alloys (FSMAs) has been investigated, in view of numerous conflicting reports of ... [more ▼]

The magnetic state of low temperature martensite phase in Co-substituted Ni-Mn-Sn-based ferromagnetic shape memory alloys (FSMAs) has been investigated, in view of numerous conflicting reports of occurrences of spin glass (SG), superparamagnetism (SPM) or long range anti-ferromagnetic (AF) ordering. Combination of DC magnetization, AC susceptibility and small angle neutron scattering (SANS) studies provide a clear evidence for AF order in martensitic phase of Ni45Co5Mn38Sn12 alloy and rule out SPM and SG orders. Identical studies on another alloy of close composition of Ni44Co6Mn40Sn10 point to presence of SG order in martensitic phase and absence of SPM behavior, contrary to earlier report. SANS results do show presence of nanometre-sized clusters but they are found to grow in size from 3 nm at 30 K to 11 nm at 300 K, and do not correlate with magnetism in these alloys. [less ▲]

Detailed reference viewed: 38 (2 UL)
See detailMagnetic properties of Ta/NdFeB core-shell microwires
Szary, Philipp UL; Luciu, Ioana; Duday, David et al

Poster (2014, November)

Detailed reference viewed: 69 (8 UL)
Peer Reviewed
See detailMagnetic SANS as a probe to disclose internal interfaces and the spin structure of nanoparticles
Michels, Andreas UL

Scientific Conference (2017, October 11)

Detailed reference viewed: 54 (3 UL)
See detailMagnetic SANS beyond the particle-matrix concept
Michels, Andreas UL

Presentation (2017, February 21)

Detailed reference viewed: 51 (3 UL)
Peer Reviewed
See detailMagnetic SANS correlation functions of bulk magnetic materials
Mettus, Denis UL; Michels, Andreas UL

Poster (2015, September 02)

We present model calculations, based on the continuum theory of micromagnetics, for the correlation function of the spin-misalignment SANS cross section of bulk ferromagnets (e.g. elemental ... [more ▼]

We present model calculations, based on the continuum theory of micromagnetics, for the correlation function of the spin-misalignment SANS cross section of bulk ferromagnets (e.g. elemental polycrystalline ferromagnets, soft and hard magnetic nanocomposites, nanoporous ferromagnets, or magnetic steels). For such materials, the spin disorder which is related to spatial variations in the saturation magnetization and magnetic anisotropy field results in strong spin-misalignment scattering dΣM/dΩ along the forward direction [1]. When the applied magnetic field is perpendicular to the incoming neutron beam, the characteristics of dΣM/dΩ (e.g. the angular anisotropy on a two-dimensional detector or the asymptotic power-law exponent) are determined by the ratio of magnetic anisotropy-field strength Hp to the jump ΔM in the saturation magnetization at internal interfaces. Here, we analyze the corresponding one and two-dimensional real-space correlations as a function of applied magnetic field, ratio Hp/ΔM, single-particle form factor, and particle volume fraction. Finally, we compare the theoretical results for the correlation function to experimental data on a Nd-Fe-B-based nanocomposite. [less ▲]

Detailed reference viewed: 60 (2 UL)
See detailMagnetic SANS is different than nonmagnetic SANS
Michels, Andreas UL

Scientific Conference (2018, June 18)

Detailed reference viewed: 25 (2 UL)
Peer Reviewed
See detailMagnetic SANS on bulk ferromagnets
Michels, Andreas UL

Scientific Conference (2016, June 08)

Detailed reference viewed: 58 (8 UL)
Peer Reviewed
See detailMagnetic SANS on bulk ferromagnets
Michels, Andreas UL

Scientific Conference (2016, September 22)

Detailed reference viewed: 49 (1 UL)
See detailMagnetic SANS on bulk magnets
Michels, Andreas UL

Presentation (2013, February 11)

Detailed reference viewed: 31 (1 UL)
See detailMagnetic SANS on bulk magnets
Michels, Andreas UL

Presentation (2013)

Detailed reference viewed: 39 (5 UL)
Peer Reviewed
See detailMagnetic SANS on nanomagnets
Michels, Andreas UL

Scientific Conference (2013, October)

Detailed reference viewed: 39 (3 UL)
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Peer Reviewed
See detailMagnetic SANS study of a sintered Nd–Fe–B magnet: Estimation of defect size
Perigo, Elio Alberto UL; Gilbert, Elliot; Michels, Andreas UL

in Acta Materialia (2015), 87

Detailed reference viewed: 137 (12 UL)
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Peer Reviewed
See detailMagnetic small-angle neutron scattering
Mühlbauer, Sebastian; Honecker, Dirk; Perigo, Elio A. et al

in Reviews of Modern Physics (2019), 91

Detailed reference viewed: 98 (9 UL)
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Peer Reviewed
See detailMagnetic small-angle neutron scattering by nanocrystalline terbium
Weissmüller, J.; Michels, D.; Michels, Andreas UL et al

in Scripta Materialia (2001), 44(8), 2357-2361

We present an experimental study of the magnetic microstructure in the nanocrystalline hard magnet Tb. Field-dependent SANS data are analyzed quantitatively in terms of the correlation function of the ... [more ▼]

We present an experimental study of the magnetic microstructure in the nanocrystalline hard magnet Tb. Field-dependent SANS data are analyzed quantitatively in terms of the correlation function of the spin misalignment. We find that up to applied fields of several Tesla the magnetization remains ‘locked in’ to the basal planes of the hcp crystal lattice of each individual crystallite; But that the in-plane orientation of the spins is highly nonuniform within each particle. This internal structure can be suppressed by the applied field. [less ▲]

Detailed reference viewed: 77 (1 UL)
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Peer Reviewed
See detailMagnetic small-angle neutron scattering of bulk ferromagnets
Michels, Andreas UL

in Journal of Physics : Condensed Matter (2014), 26

Detailed reference viewed: 123 (4 UL)