Results 11 to 20 of about 295 (125)

Coupling nanoscopic tomography and micromagnetic modelling to assess the stability of geomagnetic recorders [PDF]

Communications Earth & Environment
The recording of planetary magnetic fields is often attributed to uniformly-magnetised nanoscopic iron oxides, called single-domain. Yet, the main magnetic constituents of rocks are more complex, non-uniformly magnetised grains in single or multi-vortex ...
Ualisson Donardelli Bellon, Wyn Williams, Ricardo Ivan Ferreira Trindade, Ana Diaz, Douglas Galante   +4 more
doaj   +5 more sources

Quantifying mathematical uncertainties in Micromagnetic Tomography results [PDF]

, 2022
The recently developed Micromagnetic Tomography (MMT) technique allows precise recovery of magnetic moments of individual magnetic grains in a sample. By combining high resolution scanning magnetometry and micro X-ray computed tomography (MicroCT) MMT ...
Out, Frenk, Cortés-Ortuño, David, Fabian, Karl, Leeuwen, Tristan van, Sub Mathematical Modeling, Groot, Lennart de, Paleomagnetism   +6 more
core   +3 more sources

Magnetic Vortex States in Toroidal Iron Oxide Nanoparticles: Combining Micromagnetics with Tomography. [PDF]

Nano Lett, 2020
Iron oxide nanorings have great promise for biomedical applications because of their magnetic vortex state, which endows them with a low remanent magnetization while retaining a large saturation magnetization.
Lewis GR, Loudon JC, Tovey R, Chen YH, Roberts AP, Harrison RJ, Midgley PA, Ringe E.   +7 more
europepmc   +7 more sources

First steps towards deriving rock magnetic and paleomagnetic data from subsets of magnetic grains in lavas using Micromagnetic Tomography [PDF]

, 2020
Our understanding of the behavior of the geomagnetic field arises from magnetic signals stored in geological materials, e.g. lavas. Almost all experiments to determine the past state of the Earth's magnetic field use bulk samples (typically 1 - 10 cc ...
Harrison, Richard, Kosters, Martha, Béguin, A., Leeuwen, T. (Tristan) van, Kosters, M.E., Groot, L.V. (Lennart) de, Béguin, A. (Annemarieke), Fu, R.R. (Roger), Kosters, M.E. (Martha), Barnhoorn, A. (Auke), Fabian, K. (Karl), Harrison, R.J. (Richard), Barnhoorn, Auke, de Groot, Lennart V., Harrson, Richard, Fu, Roger, Leeuwen, Tristan, Fabian, Karl, Groot, Lennart, Béguin, Annemarieke, van Leeuwen, T.   +20 more
core   +5 more sources

The Impact of Grain‐Size Distributions of Iron‐Oxides on Paleomagnetic Measurements

Geochemistry, Geophysics, Geosystems
Magnetic signals in igneous rocks arise from assemblages of iron‐oxide bearing minerals that differ in for example, size, shape, and chemistry. Paleomagnetic measurements on bulk samples measure millions of such grains simultaneously, producing a ...
Frenk Out, Rosa A. deBoer, John Walmsley, Lennart V. deGroot   +3 more
doaj   +2 more sources

Tomography-based digital twin of Nd-Fe-B permanent magnets

npj Computational Materials
Many functional materials have been designed at the multiscale level. To properly simulate their physical properties, large and sophisticated computer models that can replicate microstructural features with nanometer-scale accuracy are required.
Anton Bolyachkin, Ekaterina Dengina, Nikita Kulesh, Xin Tang, Hossein Sepehri-Amin, Tadakatsu Ohkubo, Kazuhiro Hono   +6 more
doaj   +2 more sources

Micromagnetic Tomography applied to natural samples: first steps towards deriving rock magnetic and paleomagnetic data from subsets of magnetic grains in lavas

, 2019
Our understanding of the behavior of the geomagnetic field arises from magnetic signals stored in geological materials, e.g. lavas. Almost all experiments to determine the past state of the Earth’s magnetic field use bulk samples (typically 1 - 10 cc ...
Hilgenkamp, H. (Hans), Harrison, Richard, Leeuwen, T. (Tristan) van, Groot, L.V. (Lennart) de, Béguin, A. (Annemarieke), Fu, R.R. (Roger), Jansen, C.M.L. (Chloë), Barnhoorn, A. (Auke), Fabian, K. (Karl), Harrison, R.J. (Richard), Jansen, Chloë, Barnhoorn, Auke, Hilgenkamp, Hans, Fu, Roger, Reith, P. (Pim), Leeuwen, Tristan, Fabian, Karl, Groot, Lennart, Béguin, Annemarieke, Reith, Pim   +19 more
core   +3 more sources

Pathways toward the Use of Non-Destructive Micromagnetic Analysis for Porosity Assessment and Process Parameter Optimization in Additive Manufacturing of 42CrMo4 (AISI 4140). [PDF]

Materials (Basel)
Laser-based powder bed fusion of metals (PBF-LB/M) is a widely applied additive manufacturing technique. Thus, PBF-LB/M represents a potential candidate for the processing of quenched and tempered (Q&T) steels such as 42CrMo4 (AISI 4140), as these ...
Engelhardt A, Wegener T, Niendorf T.
europepmc   +2 more sources

Magnetic surface flux data and spatial information of magnetic grains from a Hawaiian lava and results of using this data for Micromagnetic Tomography

, 2023
Micromagnetic Tomography is a new technique which combines magnetic surface scan of a sample with spatial information (shape, location) of magnetic grains.
Out, Frenk, de Boer, Rosa A, Kosters, Martha E, Cortés-Ortuño, David Ignacio, de Groot, Lennart Vincent   +4 more
core   +1 more source

Electrostatic charging artefacts in Lorentz electron tomography of MFM tip stray fields [PDF]

, 2001
Using the technique of differential phase contrast (DPC) Lorentz electron microscopy, the magnetic stray field distribution from magnetic force microscopy (MFM) tips can be calculated in a plane in front of the tip using tomographic reconstruction ...
Scott, J., Ferrier, R.P., Gallagher, A., McVitie, S.   +3 more
core   +1 more source