Efficiency of Thermoremanent Magnetization Acquisition in Vortex‐State Particle Assemblies
Abstract Magmatic rocks record ambient magnetic fields during cooling, preserving them for billions of years through thermoremanent magnetization (TRM). TRM accuracy depends on particle size, shape, magnetic properties, and the number of particles available to record the field. While traditionally i...
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| Format: | Article |
| Language: | English |
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Wiley
2025-04-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2025GL114771 |
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| author | U. D. Bellon W. Williams A. R. Muxworthy G. F. Souza‐Junior L. Nagy L. Uieda R. I. F. Trindade |
| author_facet | U. D. Bellon W. Williams A. R. Muxworthy G. F. Souza‐Junior L. Nagy L. Uieda R. I. F. Trindade |
| author_sort | U. D. Bellon |
| collection | DOAJ |
| description | Abstract Magmatic rocks record ambient magnetic fields during cooling, preserving them for billions of years through thermoremanent magnetization (TRM). TRM accuracy depends on particle size, shape, magnetic properties, and the number of particles available to record the field. While traditionally interpreted via Neél's single‐domain theory, most particles exist in a vortex state, where complex magnetic structures require numerical modeling. We show that in fields >10μT, a few thousand nanoscopic vortex‐state particles can record TRM with less than 1° error, regardless of shape. For weaker fields, morphology plays a crucial role, with spherical and oblate particles performing best. These findings challenge assumptions about particle requirements for faithful TRM recording and highlight the influence of grain shape in paleomagnetic studies. Our results justify using smaller geological samples and magnetic microscopy to reconstruct ancient magnetic fields with precision. |
| format | Article |
| id | doaj-art-4d59b64dcd0a481e900887d060638fbf |
| institution | Kabale University |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-4d59b64dcd0a481e900887d060638fbf2025-08-20T03:44:25ZengWileyGeophysical Research Letters0094-82761944-80072025-04-01528n/an/a10.1029/2025GL114771Efficiency of Thermoremanent Magnetization Acquisition in Vortex‐State Particle AssembliesU. D. Bellon0W. Williams1A. R. Muxworthy2G. F. Souza‐Junior3L. Nagy4L. Uieda5R. I. F. Trindade6School of Geosciences University of Edinburgh Edinburgh UKSchool of Geosciences University of Edinburgh Edinburgh UKDepartment of Earth Science and Engineering Imperial College London London UKDepartment of Geophysics Institute of Astronomy Geophysics and Atmospheric Sciences (IAG) University of São Paulo São Paulo BrazilSchool of Environmental Sciences University of Liverpool Liverpool UKDepartment of Geophysics Institute of Astronomy Geophysics and Atmospheric Sciences (IAG) University of São Paulo São Paulo BrazilDepartment of Geophysics Institute of Astronomy Geophysics and Atmospheric Sciences (IAG) University of São Paulo São Paulo BrazilAbstract Magmatic rocks record ambient magnetic fields during cooling, preserving them for billions of years through thermoremanent magnetization (TRM). TRM accuracy depends on particle size, shape, magnetic properties, and the number of particles available to record the field. While traditionally interpreted via Neél's single‐domain theory, most particles exist in a vortex state, where complex magnetic structures require numerical modeling. We show that in fields >10μT, a few thousand nanoscopic vortex‐state particles can record TRM with less than 1° error, regardless of shape. For weaker fields, morphology plays a crucial role, with spherical and oblate particles performing best. These findings challenge assumptions about particle requirements for faithful TRM recording and highlight the influence of grain shape in paleomagnetic studies. Our results justify using smaller geological samples and magnetic microscopy to reconstruct ancient magnetic fields with precision.https://doi.org/10.1029/2025GL114771magnetic mineralogythermoremanencemicromagnetic modelingpaleomagnetismnatural remanent magnetizationvortex‐state |
| spellingShingle | U. D. Bellon W. Williams A. R. Muxworthy G. F. Souza‐Junior L. Nagy L. Uieda R. I. F. Trindade Efficiency of Thermoremanent Magnetization Acquisition in Vortex‐State Particle Assemblies Geophysical Research Letters magnetic mineralogy thermoremanence micromagnetic modeling paleomagnetism natural remanent magnetization vortex‐state |
| title | Efficiency of Thermoremanent Magnetization Acquisition in Vortex‐State Particle Assemblies |
| title_full | Efficiency of Thermoremanent Magnetization Acquisition in Vortex‐State Particle Assemblies |
| title_fullStr | Efficiency of Thermoremanent Magnetization Acquisition in Vortex‐State Particle Assemblies |
| title_full_unstemmed | Efficiency of Thermoremanent Magnetization Acquisition in Vortex‐State Particle Assemblies |
| title_short | Efficiency of Thermoremanent Magnetization Acquisition in Vortex‐State Particle Assemblies |
| title_sort | efficiency of thermoremanent magnetization acquisition in vortex state particle assemblies |
| topic | magnetic mineralogy thermoremanence micromagnetic modeling paleomagnetism natural remanent magnetization vortex‐state |
| url | https://doi.org/10.1029/2025GL114771 |
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