Direct observation of the thermal demagnetization of magnetic vortex structures in nonideal magnetite recorders: Thermal Demagnetization of Vortex States

Trevor P. Almeida, Adrian R. Muxworthy, András Kovács, Wyn Williams, Leslei Nagy, Pádraig O. Conbhuí, Cathrine Frandsen, Radchagrit Supakulopas, Rafal E. Dunin-Borkowski

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Abstract

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 (~250nm in diameter) during in situ heating is achieved through the construction and examination of magnetic-induction maps. Stepwise 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 that 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.
Original languageEnglish
JournalGeophysical Research Letters
Volume43
Issue number16
Pages (from-to)8426-8434
Number of pages9
ISSN0094-8276
DOIs
Publication statusPublished - 2016

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