66 research outputs found
Magnetic correlations in polycrystalline
We investigated a polycrystalline sample of the ferrimagnetic compound
by magnetometry and small-angle neutron
scattering (SANS). The magnetization curve at 300 K is characteristic for soft
ferrimagnets but at 5 K the hysteresis indicates the existence of magnetic
domains. The magnetic SANS signal suggests that at 300 K the Tb and Co moments
are correlated over large volumes within the micrometer-sized grains with
correlation lengths > 100 nm. At 5 K, however, the magnetic SANS analysis
reveals a reduced correlation length of around 4.5 nm, which indicates the
formation of narrow magnetic domains within the ferrimagnet with one dimension
being in the nm range. We attribute the observed changes of the domain
structure to the temperature-dependence of the magnetic properties of the Tb
sublattice.Comment: This is the version of the article accepted for publication including
all changes made as a result of the peer review process, as submitted to
Journal of Physics D: Applied Physics. IOP Publishing Ltd is not responsible
for any errors or omissions in this version of the manuscript or any version
derived from it. The Version of Record is available online at
doi.org/10.1088/1361-6463/ab8b9
Fingerprint of vortex-like flux closure in isotropic Nd-Fe-B bulk magnet
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-dimensional magnetization distribution within an isotropic
Nd-Fe-B bulk magnet. The magnetic neutron scattering cross section of this
system features the so-called spike anisotropy, which points towards the
presence of a strong magnetodipolar interaction. This experimental result
combined with a damped oscillatory behavior of the corresponding correlation
function and recent micromagnetic simulation results on spherical nanoparticles
suggest an interpretation of the neutron data in terms of vortex-like flux
closure patterns. The field-dependent correlation length is very well
reproduced by a power-law model used to describe the London penetration depth
in the vortex state of type-II superconductors and suggests the 'pairing'
(interaction) of magnetic vortices.Comment: 14 pages, 5 figure
Resolving complex spin textures in nanoparticles by magnetic neutron scattering
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 of the internal spin structure of nanoparticles. By
combining SANS with numerical micromagnetic computations we study the
transition from single-domain to multi-domain behavior in nanoparticles and its
implications for the ensuing magnetic SANS cross section. Above the critical
single-domain size we find that the cross section and the related correlation
function cannot be described anymore with the uniform particle model, resulting
e.g. in deviations from the well-known Guinier law. We identify a clear
signature for the occurrence of a vortex-like spin structure at remanence. The
micromagnetic approach to magnetic SANS bears great potential for future
investigations, since it provides fundamental insights into the mesoscale
magnetization profile of nanoparticles.Comment: 6 pages, 3 figure
Micromagnetic simulation of neutron scattering from spherical nanoparticles: Effect of pore-type defects
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-distance distribution function of spherical
magnetic nanoparticles. Our expression for the magnetic energy takes into
account the isotropic exchange interaction, the magnetocrystalline anisotropy,
the dipolar interaction, and an externally applied magnetic field. The
signatures of the defects and the role of the dipolar energy are highlighted
and the effect of a particle-size distribution is studied. The results serve as
a guideline to the experimentalist.Comment: arXiv admin note: text overlap with arXiv:2205.0755
Microstructural-defect-induced Dzyaloshinskii-Moriya interaction
The antisymmetric Dzyaloshinskii?Moriya interaction (DMI) plays a decisive role for the stabilization and control of chirality of skyrmion textures in various magnetic systems exhibiting a noncentrosymmetric crystal structure. A less studied aspect of the DMI is that this interaction is believed to be operative in the vicinity of lattice imperfections in crystalline magnetic materials, due to the local structural inversion symmetry breaking. If this scenario leads to an effect of sizable magnitude, it implies that the DMI introduces chirality into a very large class of magnetic materials?defect-rich systems such as polycrystalline magnets. Here, we show experimentally that the microstructural-defect-induced DMI gives rise to a polarization-dependent asymmetric term in the small-angle neutron scattering (SANS) cross section of polycrystalline ferromagnets with a centrosymmetric crystal structure. The results are supported by theoretical predictions using the continuum theory of micromagnetics. This effect, conjectured already by Arrott in 1963, is demonstrated for nanocrystalline terbium and holmium (with a large grain-boundary density), and for mechanically deformed microcrystalline cobalt (with a large dislocation density). Analysis of the scattering asymmetry allows one to determine the defect-induced DMI constant,
D=0.45±0.07mJ/m2 for Tb at 100K. Our study proves the generic relevance of the DMI for the magnetic microstructure of defect-rich ferromagnets with vanishing intrinsic DMI. Polarized SANS is decisive for disclosing the signature of the defect-induced DMI, which is related to the unique dependence of the polarized SANS cross section on the chiral interactions. The findings open up the way to study defect-induced skyrmionic magnetization textures in disordered materials
Unraveling Nanostructured Spin Textures in Bulk Magnets
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 to the large penetration depth of neutrons,
magnetic small-angle neutron scattering (SANS) is a powerful technique to
characterize bulk samples. The major challenge regarding magnetic SANS is
accessing the real-space magnetization vector field from the reciprocal
scattering data. In this letter, a fast iterative algorithm is introduced that
allows one to extract the underlying two-dimensional magnetic correlation
functions from the scattering patterns. This approach is used here to analyze
the magnetic microstructure of Nanoperm, a nanocrystalline alloy which is
widely used in power electronics due to its extraordinary soft magnetic
properties. It can be shown that the computed correlation functions clearly
reflect the projection of the three-dimensional magnetization vector field onto
the detector plane, which demonstrates that the used methodology can be applied
to probe directly spin-textures within bulk samples with nanometer-resolution.Comment: 9 pages, 3 figure
Magnetic nanoprecipitates and interfacial spin disorder in zero-field-annealed Ni50Mn45In5 Heusler alloys as seen by magnetic small-angle neutron scattering
Shell ferromagnetism is a new functional property of certain off-stoichiometric Ni–Mn–In Heusler alloys, with a potential application in non-volatile magnetic memories and recording media. One key challenge in this field remains the determination of the structural and magnetic properties of the nanoprecipitates that are the result of an annealing-induced segregation process. Thanks to its unique mesoscopic length scale sensitivity, magnetic small-angle neutron scattering appears to be a powerful technique to disclose the microstructure of such annealing-induced nanoprecipitates. In this study, the microstructure of a zero-field-annealed off-stoichiometric Ni(50)Mn(45)In(5) Heusler alloy is investigated by unpolarized magnetic small-angle neutron scattering. The neutron data analysis reveals a significant spin-misalignment scattering, which is mainly related to the formation of annealing-induced ferromagnetic nanoprecipitates in an antiferromagnetic matrix. These particles represent a source of perturbation which, due to dipolar stray fields, gives rise to canted spin moments in the surroundings of the particle–matrix interface. The presence of anticorrelations in the computed magnetic correlation function reflects the spatial perturbation of the magnetization vector around the nanoprecipitates. The magnetic field dependence of the zero crossing and the minima of the magnetic correlation function are qualitatively explained using the law of approach to ferromagnetic saturation for inhomogeneous spin states. More specifically, at remanence, the nanoprecipitates act magnetically as one superdefect with a correlation length that lies outside the experimental q range, whereas near saturation the magnetization distribution follows each individual nanoprecipitate. Analysis of the neutron data yields an estimated size of 30 nm for the spin-canted region and a value of about 75 nm for the magnetic core of the individual nanoprecipitates
Evidence for the formation of nanoprecipitates with magnetically disordered regions in bulk Ni50Mn45In5 Heusler alloys
Shell ferromagnetism is a new functional property of certain Heusler alloys
which has been recently observed in
. We report the results of a
comparative study of the magnetic microstructure of bulk
Heusler alloys using
magnetometry, synchrotron x-ray diffraction, and magnetic small-angle neutron
scattering (SANS). By combining unpolarized and spin-polarized SANS (POLARIS)
we demonstrate that a number of important conclusions regarding the mesoscopic
spin structure can be made. In particular, the analysis of the magnetic neutron
data suggests that nanoprecipitates with an effective ferromagnetic component
form in an antiferromagnetic matrix on field annealing at .
These particles represent sources of perturbation, which seem to give rise to
magnetically disordered regions in the vicinity of the particle-matrix
interface. Analysis of the spin-flip SANS cross section via the computation of
the correlation function yields a value of for the
particle size and for the size of the spin-canted
region.Comment: 11 pages, 8 figure
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