TY  - JOUR
AU  - Almeida, Trevor P.
AU  - Kasama, Takeshi
AU  - Muxworthy, Adrian R.
AU  - Williams, Wyn
AU  - Nagy, Lesleis
AU  - Hansen, Thomas W.
AU  - Brown, Paul D.
AU  - Dunin-Borkowski, Rafal
TI  - Visualized effect of oxidation on magnetic recording fidelity in pseudo-single-domain magnetite particles
JO  - Nature Communications
VL  - 5
SN  - 2041-1723
CY  - London
PB  - Nature Publishing Group
M1  - FZJ-2015-02584
SP  - 5154 
PY  - 2014
AB  - Magnetite (​Fe3O4) is an important magnetic mineral to Earth scientists, as it carries the dominant magnetic signature in rocks, and the understanding of its magnetic recording fidelity provides a critical tool in the field of palaeomagnetism. However, reliable interpretation of the recording fidelity of ​Fe3O4 particles is greatly diminished over time by progressive oxidation to less magnetic iron oxides, such as maghemite (γ-Fe2O3), with consequent alteration of remanent magnetization potentially having important geological significance. Here we use the complementary techniques of environmental transmission electron microscopy and off-axis electron holography to induce and visualize the effects of oxidation on the magnetization of individual nanoscale ​Fe3O4 particles as they transform towards γ-Fe2O3. Magnetic induction maps demonstrate a change in both strength and direction of remanent magnetization within ​Fe3O4 particles in the size range dominant in rocks, confirming that oxidation can modify the original stored magnetic information.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000343980700018
C6  - pmid:25300366
DO  - DOI:10.1038/ncomms6154
UR  - https://juser.fz-juelich.de/record/189417
ER  -