References of "Michels, Andreas 50002669"
     in
Bookmark and Share    
Full Text
Peer Reviewed
See detailSmall-angle neutron scattering study of coercivity enhancement in grain-boundary-diffused Nd-Fe-B sintered magnets
Périgo, E.A.; Titov, Ivan UL; Weber, R. et al

in Journal of Alloys & Compounds (2016), 677

Detailed reference viewed: 80 (1 UL)
See detailMagnetic neutron scattering studies on Nd-Fe-B magnets
Michels, Andreas UL

Presentation (2015, December 14)

Detailed reference viewed: 27 (1 UL)
Peer Reviewed
See detailAnisotropic magnetic correlations in nanocomposites
Michels, Andreas UL

Scientific Conference (2015, September 14)

Detailed reference viewed: 31 (3 UL)
Full Text
Peer Reviewed
See detailExcitation of Ni nanorod colloids in oscillating magnetic fields: a new approach for nanosensing investigated by TISANE
Bender, Philipp; Günther, Annegret UL; Honecker, Dirk UL et al

in Nanoscale (2015), 7

The response of a colloidal dispersion of Ni nanorods to an oscillating magnetic field was characterized by optical transmission measurements as well as small-angle neutron scattering (SANS) experiments ... [more ▼]

The response of a colloidal dispersion of Ni nanorods to an oscillating magnetic field was characterized by optical transmission measurements as well as small-angle neutron scattering (SANS) experiments using the TISANE (Time-dependent SANS experiments) technique. Exposed to a static magnetic field, the scattering intensity of the rod ensemble could be well described by the cylinder form factor using the geometrical particle parameters (length, diameter, orientation distribution) determined by transmission electronmicroscopy and magnetometry. An oscillation of the field vector resulted in a reorientation of the nanorods and a time-dependency of the scattering intensity due to the shape anisotropy of the rods. Analysis of the SANS data revealed that in the range of low frequencies the orientation distribution of the rods is comparable to the static case. With increasing frequency, the rod oscillation was gradually damped due to an increase of the viscous drag. It could be shown that despite of the increased friction in the high frequency range no observable change of the orientation distribution of the ensemble with respect to its symmetry axis occurs. [less ▲]

Detailed reference viewed: 86 (7 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: 48 (2 UL)
Peer Reviewed
See detailMagnetic neutron scattering studies on Nd-Fe-B magnets
Michels, Andreas UL

Scientific Conference (2015, September)

Detailed reference viewed: 34 (4 UL)
Peer Reviewed
See detailMagnetic small-angle neutron scattering: beyond the particle-matrix concept
Michels, Andreas UL

Poster (2015, September)

Detailed reference viewed: 41 (2 UL)
Full Text
Peer Reviewed
See detailDipolar spin-misalignment correlations in inhomogeneous magnets: Comparison between neutron scattering and micromagnetic
Erokhin, Sergey; Berkov, Dmitry; Michels, Andreas UL

in Physical Review. B : Condensed Matter (2015), 92(1), 014427

In inhomogeneous bulk ferromagnets, the dominating sources of spin disorder are related to spatial variations of (i) the magnitude of the local saturation magnetization and of (ii) the magnitude and/or ... [more ▼]

In inhomogeneous bulk ferromagnets, the dominating sources of spin disorder are related to spatial variations of (i) the magnitude of the local saturation magnetization and of (ii) the magnitude and/or direction of the magnetic anisotropy field. For the particular example of a porous ferromagnet, where the magnetization inhomogeneity is at maximum, we demonstrate, by means of experimental neutron scattering data and micromagnetic simulations, the anisotropic character of magnetization fluctuations induced by the dipolar interaction. [less ▲]

Detailed reference viewed: 48 (0 UL)
Full Text
Peer Reviewed
See detailComment on “Origin of Surface Canting within Fe3O4 Nanoparticles”
Michels, Andreas UL; Honecker, Dirk; Erokhin, Sergey et al

in Physical Review Letters (2015), (114), 149701

Detailed reference viewed: 84 (2 UL)
Full Text
Peer Reviewed
See detailSynthesis and magnetic properties of Ta/NdFeB-based composite microwires
Szary, Philipp; Luciu, Ioana; Duday, David et al

in Journal of Applied Physics (2015), 117

Detailed reference viewed: 97 (9 UL)
Full Text
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: 114 (11 UL)
Full Text
Peer Reviewed
See detailSmall-angle neutron scattering correlation functions of bulk magnetic materials
Mettus, Denis UL; Michels, Andreas UL

in Journal of Applied Crystallography (2015), 48

Detailed reference viewed: 126 (5 UL)
Full Text
Peer Reviewed
See detailThird-order effect in magnetic small-angle neutron scattering by a spatially inhomogeneous medium
Metlov, K.L.; Michels, Andreas UL

in Physical Review. B, Condensed Matter and Materials Physics (2015), 91

Detailed reference viewed: 103 (9 UL)
Full Text
Peer Reviewed
See detailSmall-angle neutron scattering of nanocrystalline gadolinium and holmium with random paramagnetic susceptibility
Döbrich, Frank; Bick, Jens-Peter; Birringer, Rainer et al

in Journal of Physics : Condensed Matter (2015), 27

Detailed reference viewed: 133 (5 UL)
See detailField-Induced Spin Helix Chirality in Nanocrystalline Ho
Szary, Philipp UL; Bick, Jens-Peter UL; Kaiser, Daniel UL et al

Poster (2014, November)

Detailed reference viewed: 67 (16 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: 65 (8 UL)
Full Text
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: 101 (3 UL)
Peer Reviewed
See detailSANS on magnetic nanostructures
Michels, Andreas UL

Scientific Conference (2014, June 29)

Detailed reference viewed: 126 (4 UL)