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\begin{document}

\title{Vortex magnetic domain state behavior in the Day plot}



\author[1]{Wyn Williams}%
\author[2]{Roberto Moreno}%
\author[3,3,4]{Adrian Muxworthy}%
\author[5]{Greig Paterson}%
\author[5]{Lesleis Nagy}%
\author[6]{Lisa Tauxe}%
\author[1,7]{Ualisson Donardelli Bellon}%
\author[1]{Idenildo Ferreira}%
\author[3]{Alison Cowan}%
\affil[1]{School of GeoSciences, University of Edinburgh}%
\affil[2]{CONICET, Instituto de Física Enrique Gaviola (IFEG)}%
\affil[3]{Department of Earth Science and Engineering, Imperial College London}%
\affil[4]{Department of Earth Sciences, University College London}%
\affil[5]{Department of Earth, Ocean and Ecological Sciences, University of Liverpool}%
\affil[6]{Scripps Institution of Oceanography, University of California}%
\affil[7]{Department of Geophysics, Institute of Astronomy, Geophysics and Atmospheric Sciences (IAG), University of São Paulo}%


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  \date{May 21, 2024}


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\begin{abstract}
The ability of rocks to hold a reliable record of the ancient
geomagnetic field depends on the structure and stability of magnetic
domain-states contained within the rock's magnetic particles. In
paleomagnetic studies, the Day plot is an easily constructed graph of
magnetic hysteresis parameters that is frequently used (and mis-used) to
estimate the likely magnetic recording stability of samples. Often
samples plot in the region of the Day plot attributed to so-called
pseudo-single-domain (PSD) particles with little under standing of the
implications for domain-states or recording fidelity. Here we use
micromagnetic models to explore the hysteresis parameters of magnetite
particles with idealized prolate and oblate truncated-octahedral
geometries containing single domain (SD), single-vortex (SV) and
occasionally multi-vortex (MV) states. We show that these do main states
exhibit a well-defined trend in the Day plot that extends from the SD
region well into the multi-domain (MD) region, all of which are likely
to be stable remanence carriers. We suggest that although the
interpretation of the Day plot and its vari33 ants might be subject to
ambiguities, if the magnetic mineralogy is known, it can still provide
some useful insights about paleomagnetic specimens' dominant domain
state, average particle sizes and, consequently, their paleomagnetic
stability.%
\end{abstract}%



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