title: Magnetic microstructure of magnetotactic bacteria by electron holography
abstract: Off-axis electron holography in the transmission electron microscope was used to correlate the physical and magnetic microstructure of magnetite nanocrystals in magnetotactic bacteria. The magnetite crystals were all single magnetic domains, and the magnetization directions of small superparamagnetic crystals were constrained by magnetic interactions with larger crystals in the chains. Shape anisotropy was found to dominate magnetocrystalline anisotropy in elongated crystals. A coercive field between 300 and 450 oersted was determined for one chain.
authors.affiliation: R. E. Dunin-Borkowski and M. R. McCartney, Center for Solid State Science, Arizona State University, Tempe, AZ 85287-1704, USA. R. B. Frankel, Department of Physics, California Polytechnic State University, San Luis Obispo, CA 93407, USA. D.
authors.initials: RE
authors.lastname: Dunin-Borkowski
authors.initials: MR
authors.lastname: McCartney
authors.initials: RB
authors.lastname: Frankel
authors.initials: DA
authors.lastname: Bazylinski
authors.initials: M
authors.lastname: Posfai
authors.initials: PR
authors.lastname: Buseck