Blar i NTNU Open på forfatter "Fabian, Karl"
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Analysis of modelled satellite magnetic data to explore lithospheric magnetization
Baykiev, Eldar (Doctoral theses at NTNU;2017:304, Doctoral thesis, 2017)The increasing availability of magnetic satellite measurements in addition to aeromagnetic data, requires new tools and concepts for interpretation and modelling. Realistic forward modelling requires a precise definition ... -
Chemical and magnetic properties of rapidly cooled metastable ferri-ilmenite solid solutions - IV: The fine structure of self-reversed thermoremanent magnetization
Robinson, Peter; McEnroe, Suzanne; Fabian, Karl; Harrison, Richard J.; Thomas, Christopher Ian; Mukai, Hiroshi (Journal article; Peer reviewed, 2014)Magnetic experiments, a Monte Carlo simulation and transmission electron microscopy observations combine to confirm variable chemical phase separation during quench and annealing of metastable ferri-ilmenite compositions, ... -
Chemical and magnetic properties of rapidly cooled metastable ferri-ilmenite solid solutions: II. Chemical changes during quenching and annealing
Robinson, Peter; Harrison, Richard J.; Miyajima, Nobuyoshi; McEnroe, Suzanne; Fabian, Karl (Journal article; Peer reviewed, 2012)Chemical and microstructural evolution during quench and short-term annealing of a sample XFeTiO3= 0.61 is explored in the light of observations in Paper I. Ordering proceeds by (1) random appearance of ordered and ... -
Chemical and magnetic properties of rapidly cooled metastable ferri-ilmenite solid solutions: implications for magnetic self-reversal and exchange bias - III. Magnetic interactions in samples produced by Fe-Ti ordering
Robinson, Peter; Harrison, Richard J.; Fabian, Karl; McEnroe, Suzanne (Journal article; Peer reviewed, 2012)Paper II of this series described the chemical and microstructural evolution of ferri-ilmenite solid solutions during high-T quench and short-term annealing. Here we explore consequences of these Fe–Ti ordering-induced ... -
Diffuse soil contamination by antimony
Reimann, Clemens; Fabian, Karl (Chapter, 2021) -
Dipole and Nondipole Evolution of the Historical Geomagnetic Field From Instrumental, Archeomagnetic, and Volcanic Data
Arneitz, P.; Leonhardt, R.; Egli, R.; Fabian, Karl (Peer reviewed; Journal article, 2021)Although a large number of magnetic declination and inclination measurements are available for the historical period from 1400 to 1900 CE, even the evolution of the axial dipole moment, the most prominent quantity of the ... -
A First-Order Statistical Exploration of the Mathematical Limits of Micromagnetic Tomography
Out, Frenk; Cortés-Ortuño, David; Fabian, Karl; van Leeuwen, Tristan; de Groot, Lennart V. (Peer reviewed; Journal article, 2022)The recently developed Micromagnetic Tomography (MMT) technique combines advances in high resolution scanning magnetometry and micro X-ray computed tomography. This allows precise recovery of magnetic moments of individual ... -
GEOPHYSICAL SIGNALS OF FAULTS AND LINEAMENTS
Rezaei Asa, Kiana (Master thesis, 2024)Denne forskningen har som mål å undersøke effektiviteten av geomagnetiske metoder for å identifisere geologiske forkastninger og forstå hvordan forkastninger påvirker magnetiske feltdiagrammer. I tillegg utforsker studien ... -
Hysteresis of Natural Magnetite Ensembles: Micromagnetics of Silicate‐Hosted Magnetite Inclusions Based on Focused‐Ion‐Beam Nanotomography
Nikolaisen, Even; Harrison, Richard; Fabian, Karl; McEnroe, Suzanne (Peer reviewed; Journal article, 2020)Three‐dimensional geometries of silicate‐hosted magnetic inclusions from the Harcus intrusion, South Australia have been determined using focused‐ion‐beam nanotomography (FIB‐nt). By developing an effective workflow, the ... -
Impact of an iron mine and a nickel smelter at the Norwegian/Russian border close to the Barents Sea on soil magnetic susceptibility and content of potentially toxic elements
Magiera, Tadeusz; Zavadzki, Jaroslaw; Szuszkiewicz, Marcin; Fabijanczyk, Piotr; Steinnes, Eiliv; Fabian, Karl; Miszczak, Ewa (Journal article; Peer reviewed, 2018) -
Influence of lattice-preferred orientation with respect to magnetizing field on intensity of remanent magnetization in polycrystalline hemo-ilmenite
Robinson, P.; Fabian, Karl; McEnroe, Suzanne; Heidelbach, F (Journal article; Peer reviewed, 2012)New experimental and computational approaches to interpret orientation and intensity of natural remanent magnetization (NRM) carried by lamellar magnetism are applied to historic magnetic measurements on a collection of ... -
Lamellar magnetism and exchange bias in billion-year-old metamorphic titanohematite with nanoscale ilmenite exsolution lamellae-III. Atomic-magnetic basis for experimental results
Robinson, Peter; McEnroe, Suzanne; Harrison, Richard John; Fabian, Karl; Heidelbach, Florian; Jackson, Michael (Peer reviewed; Journal article, 2021)Lamellar magnetism is a source of remanent magnetization in natural rocks different from common bulk magnetic moments in ferrimagnetic minerals. It has been found to be a source for a wide class of magnetic anomalies with ... -
Measuring the Curie temperature
Fabian, Karl; Shcherbakov, V. P; McEnroe, Suzanne (Journal article; Peer reviewed, 2013)[1] Curie point temperatures (TC) of natural and synthetic magnetic materials are commonly determined in rock magnetism by several measurement methods that can be mutually incompatible and may lead to inconsistent results. ... -
Micromagnetic Modes of Anisotropy of Magnetic Susceptibility in Natural Magnetite Particles
Nikolaisen, Even Sunnanå; Fabian, Karl; Harrison, J. Richard; McEnroe, Suzanne (Peer reviewed; Journal article, 2022)Anisotropy of magnetic susceptibility (AMS) is commonly used to assess sedimentation, deformation, tectonics, rock fabric, and texture. Using focused-ion beam nanotomography, we develop a micromagnetic method to investigate ... -
Mineral Magnetic Characterization of High-Latitude Sediments From Lake Levinson-Lessing, Siberia
Scheidt, Stephanie; Egli, Ramon; Lenz, Matthias; Rolf, Christian; Fabian, Karl; Melles, Martin (Peer reviewed; Journal article, 2021)Levinson-Lessing Lake in northern Central Siberia is a sedimentary archive characterized by continuous, widely constant sedimentation at high rates (0.7 m ka−1 for >32 ka). This study provides the first evidence of the ... -
Multiscale 3D Analysis of Silicate- Hosted Magnetic Inclusions
Nikolaisen, Even Sunnanå (Doctoral theses at NTNU;2022:256, Doctoral thesis, 2022) -
Nonlinear Preisach maps: Detecting and characterizing separate remanent magnetic fractions in complex natural samples
Church, Nathan Stewart; Fabian, Karl; McEnroe, Suzanne (Peer reviewed; Journal article, 2016)Natural remanent magnetization carriers in rocks can contain mixtures of magnetic minerals that interact in complex ways and are challenging to characterize by current measurement techniques. Here a nonlinear mapping scheme ... -
Separating geometry- from stress-induced remanent magnetization in magnetite with ilmenite lamellae from the Stardalur basalts, Iceland
ter Maat, Geertruida Wilhelmina; Fabian, Karl; Church, Nathan Stewart; McEnroe, Suzanne (Peer reviewed; Journal article, 2020)Realistic geometries of magnetite grains from the Stardalur volcano, Iceland, were obtained by Focused Ion Beam Scanning Electron Microscopy nanotomography. These magnetite grains are subdivided by oxidation‐exsolution ... -
Single Particle Multipole Expansions From Micromagnetic Tomography
Cortés-Ortuño, David; Fabian, Karl; De Groot, Lennart V. (Peer reviewed; Journal article, 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). ... -
Size and shape dependence of the magnetic ordering temperature in nanoscale magnetic particles
Shcherbakov, V. P; Fabian, Karl; Sycheva, N. K.; McEnroe, Suzanne (Journal article; Peer reviewed, 2012)Natural rocks and synthetic analogues can contain extremely small scaled magnetic minerals varying in shape from approximately equidimensional nanoparticles to lower dimensionally shaped lamellae resembling thin films or ...