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Science 4 December 1998:
Vol. 282. no. 5395, pp. 1868 - 1870
DOI: 10.1126/science.282.5395.1868
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Reports

Magnetic Microstructure of Magnetotactic Bacteria by Electron Holography

Rafal E. Dunin-Borkowski, Martha R. McCartney, Richard B. Frankel, Dennis A. Bazylinski, Mihály Pósfai, * Peter R. Buseck

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.

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. A. Bazylinski, Department of Microbiology, Iowa State University, Ames, IA 50011, USA. M. Pósfai and P. R. Buseck, Departments of Geology and Chemistry/Biochemistry, Arizona State University, Tempe, AZ 85287-1404, USA.
*   Present address: Department of Earth and Environmental Sciences, University of Veszprém, Veszprém, POB 158, H-8201, Hungary.

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