Results 1 to 10 of about 873 (149)
Single Particle Multipole Expansions From Micromagnetic Tomography [PDF]
Geochemistry, Geophysics, Geosystems, 2021 Micromagnetic tomography aims at reconstructing large numbers of individual magnetizations of magnetic particles from combining high‐resolution magnetic scanning techniques with micro X‐ray computed tomography (microCT).
David Cortés‐Ortuño +2 more
doaj +10 more sources
Micromagnetic Tomography for Paleomagnetism and Rock-Magnetism. [PDF]
J Geophys Res Solid Earth, 2021 Abstract Our understanding of the past behavior of the geomagnetic field arises from magnetic signals stored in geological materials, e.g., (volcanic) rocks. Bulk rock samples, however, often contain magnetic grains that differ in chemistry, size, and shape; some of them record the Earth's magnetic field well, others are unreliable ...
de Groot LV +9 more
europepmc +10 more sources
A First‐Order Statistical Exploration of the Mathematical Limits of Micromagnetic Tomography
Geochemistry, Geophysics, Geosystems, 2022 The recently developed Micromagnetic Tomography (MMT) technique combines advances in high resolution scanning magnetometry and micro X‐ray computed tomography.
Frenk Out +4 more
doaj +4 more sources
Geochemistry, Geophysics, Geosystems, 2023 Micromagnetic Tomography (MMT) is a new technique that allows the determination of magnetic moments of individual grains in volcanic rocks. Current MMT studies either showed that it is possible to obtain magnetic moments of relatively small numbers of ...
Martha E. Kosters +4 more
doaj +3 more sources
Most frequently asked questions about the coercivity of Nd-Fe-B permanent magnets [PDF]
Science and Technology of Advanced Materials, 2021 Physically, the coercivity of permanent magnets should scale with the anisotropy field of ferromagnetic compounds, HA; however, the typical coercivity values of commercial polycrystalline sintered magnets are only ~0.2 HA, which is known as Brown’s ...
Jiangnan Li +4 more
doaj +2 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. Here we use micromagnetic simulations to predict the exact shapes that can sustain magnetic vortices, using a toroidal model geometry with ...
Lewis GR +7 more
europepmc +6 more sources
Communications Earth & EnvironmentThe 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 +4 more
doaj +3 more sources
Quantifying the topology of magnetic skyrmions in three dimensions. [PDF]
Sci AdvMagnetic skyrmions have so far been treated as two-dimensional spin structures characterized by a topological winding number. However, in real systems with the finite thickness of the device material being larger than the magnetic exchange length, the ...
Raftrey D +9 more
europepmc +3 more sources
Magnetic vector tomography reveals giant magnetofossils are optimised for magnetointensity reception. [PDF]
Commun Earth EnvironGiant magnetofossils are unusual, micron-sized biogenic magnetite particles found in sediments dating back at least 97 million years. Their distinctive morphologies are the product of biologically controlled mineralisation, yet the identity of their ...
Harrison RJ +15 more
europepmc +3 more sources
Mapping Magnetic Signals of Individual Magnetite Grains to Their Internal Magnetic Configurations Using Micromagnetic Models. [PDF]
J Geophys Res Solid Earth, 2022 Cortés-Ortuño D +2 more
europepmc +2 more sources