Postprint version. Published in Physica B: Condensed Matter, Volume 384, Issue 1-2, October 1, 2006, pages 249-252. Copyright © 2006 Elsevier. The definitive version is available at http://dx.doi.org/10.1016/j.physb.2006.06.002.
Transmission electron microscopy, off-axis electron holography and energy-selected imaging were used to study the crystallography, morphology, and magnetic microstructure of nanoscale greigite (Fe3S4) magnetosomes in magnetotactic bacteria from a sulfidic habitat. The greigite magnetosomes were organized in chains, but were less ordered than magnetite magnetosomes in other bacteria. Nevertheless, the magnetosomes comprise a permanent magnetic dipole, sufficient for magnetotaxis.