%0 Journal Article
%A Almeida, Trevor P.
%A Kasama, Takeshi
%A Muxworthy, Adrian R.
%A Williams, Wyn
%A Nagy, Lesleis
%A Dunin-Borkowski, Rafal
%T Observing thermomagnetic stability of nonideal magnetite particles: Good paleomagnetic recorders?
%J Geophysical research letters
%V 41
%N 20
%@ 0094-8276
%C Hoboken, NJ
%I Wiley
%M FZJ-2015-02578
%P 7041 - 7047
%D 2014
%X 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
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000345343100008
%R 10.1002/2014GL061432
%U https://juser.fz-juelich.de/record/189411