Journal Article

FZJ-2015-02578

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Observing thermomagnetic stability of nonideal magnetite particles: Good paleomagnetic recorders?

Almeida, T. P. (Corresponding Author) ; Kasama, T. ; Muxworthy, A. R. ; Williams, W. ; Nagy, L. ; Dunin-Borkowski, R.FZJ*

2014
Wiley Hoboken, NJ

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Please use a persistent id in citations: http://hdl.handle.net/2128/16081  doi:10.1002/2014GL061432

Abstract: The thermomagnetic behavior of remanence-induced magnetite (Fe3O4) particles in the pseudo-single-domain (PSD) size range (~0.1–10 µm), which dominate the magnetic signature of many rock lithologies, is investigated using off-axis electron holography. Construction of magnetic induction maps allowed for the visualization of the vortex domain state in an individual Fe3O4 grain (~200 nm in diameter) as a function of temperature. Acquisition of a series of electron holograms at 100°C intervals during in situ heating up to 700°C demonstrates the vortex state of the Fe3O4 grain, in this instance, remains thermally stable close to its unblocking temperature and exhibits a similar in-plane remanent state upon cooling; i.e., the particle is effectively behaving like a uniaxial single-domain particle to temperatures near TC. Such particles are thought to be robust magnetic recorders. It is suggested that evidence for PSD behavior should therefore not preclude paleomagnetic investigation

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Contributing Institute(s):

1. Mikrostrukturforschung (PGI-5)

Research Program(s):

1. 42G - Peter Grünberg-Centre (PG-C) (POF2-42G41) (POF2-42G41)

Appears in the scientific report 2014

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Database coverage:
; ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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