72 citations · 503 across the 38 of their papers we have counts for
26 papers · 1 filter
Fingerprint of vortex-like flux closure in isotropic Nd-Fe-B bulk magnet
Mathias Bersweiler, Yojiro Oba, Evelyn Pratami Sinaga +5
Taking advantage of recent progress in neutron instrumentation and in the understanding of magnetic-field-dependent small-angle neutron scattering, here, we study the three-dimensi…
Generic role of the Dzyaloshinskii-Moriya interaction in nanocrystalline ferromagnets
S. Erokhin, D. Berkov, A. Michels
Motivated by recent experimental polarized neutron results, we present a numerical micromagnetic study of the interfacial (intergrain) Dzyaloshinskii-Moriya interaction (DMI) in na…
Micromagnetic simulation of neutron scattering from spherical nanoparticles: Effect of pore-type defects
Evelyn Pratami Sinaga, Michael P. Adams, Mathias Bersweiler +6
We employ micromagnetic simulations to model the effect of pore-type microstructural defects on the magnetic small-angle neutron scattering cross section and the related pair-dista…
Magnetic neutron scattering from spherical nanoparticles with Neel surface anisotropy: Atomistic simulations
Michael P. Adams, Andreas Michels, Hamid Kachkachi
We consider a dilute ensemble of randomly-oriented noninteracting spherical nanomagnets and investigate its magnetization structure and ensuing neutron-scattering response by numer…
Magnetic neutron scattering from spherical nanoparticles with Neel surface anisotropy: Analytical treatment
Michael P. Adams, Andreas Michels, Hamid Kachkachi
The magnetization profile and the related magnetic small-angle neutron scattering cross section of a single spherical nanoparticle with Neel surface anisotropy is analytically inve…
Small-angle neutron scattering by spatially inhomogeneous ferromagnets with a nonzero average uniaxial anisotropy
V. D. Zaporozhets, Y. Oba, A. Michels +1
Micromagnetic small-angle neutron scattering theory is well established for analyzing spin-misalignment scattering data of bulk ferromagnets. Here, this theory is extended to allow…
Revealing defect-induced spin disorder in nanocrystalline Ni
Mathias Bersweiler, Evelyn Pratami Sinaga, Inma Peral +7
We combine magnetometry and magnetic small-angle neutron scattering to study the influence of the microstructure on the macroscopic magnetic properties of a nanocrystalline Ni bulk…
The benefits of a Bayesian analysis for the characterization of magnetic nanoparticles
Mathias Bersweiler, Helena Gavilan Rubio, Dirk Honecker +2
Magnetic nanoparticles offer a unique potential for various biomedical applications, but prior to commercial usage a standardized characterization of their structural and magnetic…
Magnetic correlations in polycrystalline
Mathias Bersweiler, Philipp Bender, Inma Peral +5
We investigated a polycrystalline sample of the ferrimagnetic compound by magnetometry and small-angle neutron scattering (SANS). The magnetization cu…
Resolving complex spin textures in nanoparticles by magnetic neutron scattering
Laura G. Vivas, Rocio Yanes, Dmitry Berkov +5
In the quest to image the three-dimensional magnetization structure we show that the technique of magnetic small-angle neutron scattering (SANS) is highly sensitive to the details…
Unraveling Nanostructured Spin Textures in Bulk Magnets
Philipp Bender, Jonathan Leliaert, Mathias Bersweiler +2
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…
Magnetic Guinier law
A. Michels, A. Malyeyev, I. Titov +4
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…
Size-dependent spatial magnetization profile of manganese-zinc ferrite Mn0.2Zn0.2Fe2.6O4 nanoparticles
Mathias Bersweiler, Philipp Bender, Laura G. Vivas +7
We report the results of an unpolarized small-angle neutron scattering (SANS) study on Mn-Zn ferrite (MZFO) magnetic nanoparticles with the aim to elucidate the interplay between t…
Effect of grain-boundary diffusion process on the geometry of the grain microstructure of NdFeB nanocrystalline magnets
Ivan Titov, Massimiliano Barbieri, Philipp Bender +6
Hot-deformed anisotropic NdFeB nanocrystalline magnets have been subjected to the grain-boundary diffusion process (GBDP) using a eutectic…
Evidence for the formation of nanoprecipitates with magnetically disordered regions in bulk Heusler alloys
Giordano Benacchio, Ivan Titov, Artem Malyeyev +12
Shell ferromagnetism is a new functional property of certain Heusler alloys which has been recently observed in . We report the res…
Spin structures of textured and isotropic Nd-Fe-B-based nanocomposites: Evidence for correlated crystallographic and spin texture
Andreas Michels, Raoul Weber, Ivan Titov +9
We report the results of a comparative study of the magnetic microstructure of textured and isotropic - nanocomposites using…
Effect of Dzyaloshinski-Moriya interaction on spin-polarized neutron scattering
Andreas Michels, Denis Mettus, Dirk Honecker +1
For magnetic materials containing many lattice imperfections (e.g., nanocrystalline magnets), the relativistic Dzyaloshinski-Moriya (DM) interaction may result in nonuniform spin t…
Magnetic neutron scattering by magnetic vortices in thin submicron-sized soft ferromagnetic cylinders
Konstantin L. Metlov, Andreas Michels
Using analytical expressions for the magnetization textures of thin submicron-sized magnetic cylinders in vortex state, we derive closed-form algebraic expressions for the ensuing…
Dipolar spin-misalignment correlations in inhomogeneous magnets: comparison between neutron scattering and micromagnetic approaches
Sergey Erokhin, Dmitry Berkov, Andreas Michels
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)…
Comment on "Origin of Surface Canting within Nanoparticles"
Andreas Michels, Dirk Honecker, Sergey Erokhin +1
We comment on the Letter "Origin of surface canting within nanoparticles" by K.L. Krycka et al. [Phys. Rev. Lett. , 147203 (2014)].
Critical behavior of nanocrystalline gadolinium: Evidence for a new universality class
A. Ferdinand, A. -C. Probst, A. Michels +2
We report on how nanocrystal size affects the critical behavior of the rare-earth metal Gd near the ferromagnetic-to-paramagnetic phase transition. The asymptotic critical behavior…
Analysis of magnetic neutron-scattering data of two-phase ferromagnets
Dirk Honecker, Charles D. Dewhurst, Kiyonori Suzuki +2
We have analyzed magnetic-field-dependent small-angle neutron scattering (SANS) data of soft magnetic two-phase nanocomposite ferromagnets in terms of a recent micromagnetic theory…
Theory of magnetic small-angle neutron scattering of two-phase ferromagnets
Dirk Honecker, Andreas Michels
Based on micromagnetic theory we have derived analytical expressions for the magnetic small-angle neutron scattering (SANS) cross section of a two-phase particle-matrix-type ferrom…
Micromagnetic simulation of magnetic small-angle neutron scattering from two-phase nanocomposites
Andreas Michels, Sergey Erokhin, Dmitry Berkov +1
The recent development of a micromagnetic simulation methodology - suitable for multiphase magnetic nanocomposites - permits the computation of the magnetic microstructure and of t…