@article{Almeida:2016:10.1002/2016GL070074,
author = {Almeida, TP and Muxworthy, AR and Kovacs, A and Williams, W and Nagy, L and Conbhuí, PC and Frandsen, C and Supakulopus, R and Dunin-Borkowski, RE},
doi = {10.1002/2016GL070074},
journal = {Geophysical Research Letters},
pages = {8426--8434},
title = {Direct observation of the thermal demagnetization of magnetic vortex structures in non-ideal magnetite recorders},
url = {http://dx.doi.org/10.1002/2016GL070074},
volume = {43},
year = {2016}
}

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TY  - JOUR
AB  - The thermal demagnetization of pseudo-single-domain (PSD) magnetite (Fe3O4) particles, which govern the magnetic signal in many igneous rocks, is examined using off-axis electron holography. Visualization of a vortex structure held by an individual Fe3O4 particle (~ 250 nm in diameter) during in situ heating is achieved through the construction and examination of magnetic-induction maps. Step-wise demagnetization of the remanence-induced Fe3O4 particle upon heating to above the Curie temperature, performed in a similar fashion to bulk thermal demagnetization measurements, revealed its vortex state remains stable under heating close to its unblocking temperature, and is recovered upon cooling with the same or reversed vorticity. Hence, the PSD Fe3O4 particle exhibits thermomagnetic behavior comparable to a single-domain carrier, and thus vortex-states are considered reliable magnetic recorders for paleomagnetic investigations.
AU  - Almeida,TP
AU  - Muxworthy,AR
AU  - Kovacs,A
AU  - Williams,W
AU  - Nagy,L
AU  - Conbhuí,PC
AU  - Frandsen,C
AU  - Supakulopus,R
AU  - Dunin-Borkowski,RE
DO  - 10.1002/2016GL070074
EP  - 8434
PY  - 2016///
SN  - 1944-8007
SP  - 8426
TI  - Direct observation of the thermal demagnetization of magnetic vortex structures in non-ideal magnetite recorders
T2  - Geophysical Research Letters
UR  - http://dx.doi.org/10.1002/2016GL070074
UR  - http://hdl.handle.net/10044/1/38662
VL  - 43
ER  - 

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