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   Magnetic Guinier lawMichels, Andreas  ; Malyeyev, Artem ; Titov, Ivan et alin IUCrJ (2020), 7 Small-angle scattering of x-rays and neutrons is a routine method for the determination of nanoparticle sizes. The so-called Guinier law represents the low-q approximation for the small-angle scattering ... [more ▼] Small-angle scattering of x-rays and neutrons is a routine method for the determination of nanoparticle sizes. The so-called Guinier law represents the low-q approximation for the small-angle scattering curve from an assembly of particles. The Guinier law has originally been derived for nonmagnetic particle-matrix-type systems, and it is successfully employed for the estimation of particle sizes in various scientific domains (e.g., soft matter physics, biology, colloidal chemistry, materials science). An important prerequisite for it to apply is the presence of a discontinuous interface separating particles and matrix. Here, we introduce the Guinier law for the case of magnetic small-angle neutron scattering (SANS) and experimentally demonstrate its applicability for the example of nanocrystalline cobalt. It is well- known that the magnetic microstructure of nanocrystalline ferromagnets is highly nonuniform on the nanometer length scale and characterized by a spectrum of continuously varying long-wavelength magnetization fluctuations, i.e., these systems do not manifest sharp interfaces in their magnetization profile. The magnetic Guinier radius depends on the applied magnetic field, on the magnetic interactions (exchange, magnetostatics), and on the magnetic anisotropy-field radius, which characterizes the size over which the magnetic anisotropy field is coherently aligned into the same direction. In contrast to the nonmagnetic conventional Guinier law, the magnetic version can be applied to fully dense random-anisotropy-type ferromagnets. [less ▲] Detailed reference viewed: 31 (9 UL)Magnetic Guinier LawMalyeyev, Artem ; Michels, Andreas Poster (2019, June) We introduce the Guinier law for the case of magnetic SANS and provide an analysis of experimental data on a Nd-Fe-B-based nanocomposite and on a rare-earth-free MnBi permanent magnet. The robustness of ... [more ▼] We introduce the Guinier law for the case of magnetic SANS and provide an analysis of experimental data on a Nd-Fe-B-based nanocomposite and on a rare-earth-free MnBi permanent magnet. The robustness of this novel approach is discussed and the quantities derived are analyzed in the framework of the existing research literature. [less ▲] Detailed reference viewed: 88 (14 UL)Evidence for the formation of nanoprecipitates with magnetically disordered regions in bulk Ni50Mn45In5 Heusler alloys; Titov, Ivan ; Malyeyev, Artem et alin Physical Review. B, Condensed Matter and Materials Physics (2019), 99 Detailed reference viewed: 151 (18 UL)Microstructural-defect-induced Dzyaloshinskii-Moriya interactionMichels, Andreas ; ; Titov, Ivan et alin Physical Review. B, Condensed Matter (2019), 99 Detailed reference viewed: 141 (19 UL)Field-Induced Spin Helix Chirality in Nanocrystalline HoSzary, Philipp ; Bick, Jens-Peter ; Kaiser, Daniel et alPoster (2014, November) Detailed reference viewed: 80 (16 UL) Single Second Laser Annealed CuInSe2 Semiconductors from Electrodeposited Precursors as Absorber Layers for Solar CellsMeadows, Helen ; ; Depredurand, Valérie et alin Journal of Physical Chemistry C (2014), 118 (3) Detailed reference viewed: 161 (10 UL) |
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