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@ARTICLE{Almeida:827066,
author = {Almeida, T. P. and Muxworthy, A. R. and Kovacs, Andras and
Williams, W. and Brown, P. D. and Dunin-Borkowski, Rafal},
title = {{D}irect visualization of the thermomagnetic behavior of
pseudo-single-domain magnetite particles},
journal = {Science advances},
volume = {2},
number = {4},
issn = {2375-2548},
address = {Washington, DC [u.a.]},
publisher = {Assoc.},
reportid = {FZJ-2017-01272},
pages = {e1501801 - e1501801},
year = {2016},
abstract = {The study of the paleomagnetic signal recorded by rocks
allows scientists to understand Earth’s past magnetic
field and the formation of the geodynamo. The magnetic
recording fidelity of this signal is dependent on the
magnetic domain state it adopts. The most prevalent example
found in nature is the pseudo–single-domain (PSD)
structure, yet its recording fidelity is poorly understood.
Here, the thermoremanent behavior of PSD magnetite (Fe3O4)
particles, which dominate the magnetic signatures of many
rock lithologies, is investigated using electron holography.
This study provides spatially resolved magnetic information
from individual Fe3O4 grains as a function of temperature,
which has been previously inaccessible. A small exemplar
Fe3O4 grain (~150 nm) exhibits dynamic movement of its
magnetic vortex structure above 400°C, recovering its
original state upon cooling, whereas a larger exemplar Fe3O4
grain (~250 nm) is shown to retain its vortex state on
heating to 550°C, close to the Curie temperature of 580°C.
Hence, we demonstrate that Fe3O4 grains containing vortex
structures are indeed reliable recorders of paleodirectional
and paleointensity information, and the presence of PSD
magnetic signals does not preclude the successful recovery
of paleomagnetic signals.},
cin = {PGI-5 / ER-C-1},
ddc = {500},
cid = {I:(DE-Juel1)PGI-5-20110106 / I:(DE-Juel1)ER-C-1-20170209},
pnm = {143 - Controlling Configuration-Based Phenomena (POF3-143)},
pid = {G:(DE-HGF)POF3-143},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000380072100040},
pubmed = {pmid:27152353},
doi = {10.1126/sciadv.1501801},
url = {https://juser.fz-juelich.de/record/827066},
}