TY  - JOUR
AU  - Almeida, Trevor P.
AU  - Kasama, Takeshi
AU  - Muxworthy, Adrian R.
AU  - Williams, Wyn
AU  - Nagy, Lesleis
AU  - Dunin-Borkowski, Rafal
TI  - Observing thermomagnetic stability of nonideal magnetite particles: Good paleomagnetic recorders?
JO  - Geophysical research letters
VL  - 41
IS  - 20
SN  - 0094-8276
CY  - Hoboken, NJ
PB  - Wiley
M1  - FZJ-2015-02578
SP  - 7041 - 7047
PY  - 2014
AB  - 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
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000345343100008
DO  - DOI:10.1002/2014GL061432
UR  - https://juser.fz-juelich.de/record/189411
ER  -