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Magnetic Microstructure of Magnetotactic Bacteria by Electron Holography
  • Rafal E. Dunin-Borkowski, Arizona State University
  • Martha R. McCartney, Arizona State University
  • Richard B. Frankel, California Polytechnic State University - San Luis Obispo
  • Dennis A. Bazylinski, Iowa State University
  • Mihály Pósfai, Arizona State University
  • Peter R. Buseck, Arizona State University
Publication Date
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.
Citation Information
Rafal E. Dunin-Borkowski, Martha R. McCartney, Richard B. Frankel, Dennis A. Bazylinski, et al.. "Magnetic Microstructure of Magnetotactic Bacteria by Electron Holography" Science Vol. 282 Iss. 5395 (1998) p. 1868 - 1870
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