Results 11 to 20 of about 1,042,533 (119)

Increasing the Accuracy and Efficiency of Micromagnetic Tomography by Double Sided Scanning

Journal of Geophysical Research: Solid Earth
Paleomagnetic data are usually retrieved by subjecting bulk samples, e.g. lavas, to laboratory measurement protocols. In many instances, these protocols yield uninterpretable results caused by the presence of particles with adverse magnetic properties that blur the signal of the reliable magnetic particles.
Rosa De Boer, Lennart V De Groot, Martha Kosters   +2 more
exaly   +4 more sources

Micromagnetic modelling and multipole expansions from Micromagnetic Tomography

, 2021
Micromagnetic Tomography (MMT) is a technique that combines X-ray micro tomography and scanning magnetometry data to numerically invert the surface magnetic signal for the magnetic potential of individual magnetic grains via their spherical harmonic expansion [1]. The dipole and higher order multipole moment solutions are uniquely determined, which has
David Cortés-Ortuño, Karl Fabian, Lennart de Groot   +2 more
openaire   +2 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 steels
Engelhardt A, Wegener T, Niendorf T.
europepmc   +2 more sources

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

, 2020
<p>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) and measure their magnetic moment after series of laboratory ...
Lennart de Groot, Karl Fabian, Annemarieke Béguin, Martha Kosters, Roger Fu, Richard Harrison, Auke Barnhoorn, Tristan van Leeuwen   +7 more
openaire   +5 more sources

Improving co-registration of geoscientific imaging datasets with micro-sized marker structures on rock samples [PDF]

Geoscientific Instrumentation, Methods and Data Systems
Polished geological samples are frequently used in geoscientific research to investigate the chemical and physical characteristics of rocks. A broad range of imaging techniques is available to analyze such samples, but when combining datasets from ...
R. A. de Boer, D. H. Wielens, L. V. de Groot   +2 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

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

The Importance of Sample‐to‐Sensor Distance in Quantitative Micro(Paleo‐)Magnetic Analysis

Geochemistry, Geophysics, Geosystems
Information on the past of Earth's magnetic field can be retrieved from magnetic grains in rock samples. Micromagnetic Tomography (MMT) is a recently developed method that uses magnetic surface scans from a Quantum Diamond Microscope (QDM) combined with ...
Rosa A. deBoer, Frenk Out, Bertwin M. deGroot, Martha E. Kosters, Lennart V. deGroot   +4 more
doaj   +2 more sources

Harnessing Digital Microstructure for Simulation‐Guided Optimization of Permanent Magnets

Advanced Intelligent Discovery, EarlyView.
Optimization of functional materials with properties governed by complex microstructures remains a central challenge in materials science. Accurate modeling of microstructure‐property relationships is often limited by idealized geometries and ...
N. Kulesh, A. Bolyachkin, Hajime Nakamura, Tadakatsu Ohkubo, H. Sepehri‐Amin   +4 more
semanticscholar   +2 more sources

Nanomagnetic properties of the meteorite cloudy zone. [PDF]

Proc Natl Acad Sci U S A, 2018
Significance The cloudy zone is naturally occurring nanocomposite found in Fe–Ni metal-bearing meteorites. It not only is a potent carrier of paleomagnetic information from the early solar system but also shows promise as a sustainable alternative to ...
Einsle JF, Eggeman AS, Martineau BH, Saghi Z, Collins SM, Blukis R, Bagot PAJ, Midgley PA, Harrison RJ.   +8 more
europepmc   +2 more sources