Imperial College London
Portrait Picture

Professor Adrian Muxworthy

Faculty of Engineering, Department of Earth Science & Engineering

Professor of Earth and Planetary Magnetism
 
 
 
//

Contact

 

+44 (0)20 7594 6442adrian.muxworthy

 
 
//

Location

 

4.48Royal School of MinesSouth Kensington Campus

//

Summary

 

Publications

Citation

BibTex format

@article{Nagy:2023:10.1029/2022GL101032,
author = {Nagy, L and Tauxe, L and Williams, W and Muxworthy, A},
doi = {10.1029/2022GL101032},
journal = {Geophysical Research Letters},
title = {Chasing tails: Insights from micromagnetic modeling for thermomagnetic recording in non-uniform magnetic structures},
url = {http://dx.doi.org/10.1029/2022GL101032},
volume = {49},
year = {2023}
}
Download

RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Paleointensities are key to understanding the formation and evolution of Earth and are determined from rocks which record magnetic fields upon cooling; however, experimental protocols for estimating paleointensities frequently fail. The primary reason is that laboratory protocols assume that rocks are dominated by uniformly magnetized, single-domain grains, instead of much more common non-uniformly magnetized grains. Our model for larger grains shows a multiplicity of stable domain states; with preferred states changing as a function of temperature. We show that domain state distribution depends on the thermal history of the sample—in nature and the laboratory. From numerical thermomagnetic modeling, we show that particles with non-uniform domain states will theoretically fail standard experimental paleointensity protocols, preventing us from determining reliable ancient geomagnetic field intensities. We propose that recognizing this type of behavior, and the resulting bias, will yield more reliable paleointensity records, and a better understanding of the Earth.
AU  - Nagy,L
AU  - Tauxe,L
AU  - Williams,W
AU  - Muxworthy,A
DO  - 10.1029/2022GL101032
PY  - 2023///
SN  - 0094-8276
TI  - Chasing tails: Insights from micromagnetic modeling for thermomagnetic recording in non-uniform magnetic structures
T2  - Geophysical Research Letters
UR  - http://dx.doi.org/10.1029/2022GL101032
UR  - http://hdl.handle.net/10044/1/101892
VL  - 49
ER  -
Download