... microstructures, chemical compositions, and three-dimensional morphologies and positions of Fe-sulfide crystals in air-dried cells of magnetotactic bacteria. Data were obtained using several transmission electron microscopy techniques that include electron holography, energy-filtered imaging, electron tomography...

...Rafal E. DUNIN-BORKOWSKI; Martha R. McCARTNEY; Mihály PÓSFAI; Richard B. FRANKEL; Dennis A. BAZYLINSKI; Peter R. BUSECK Abstract Off-axis electron holography in the transmission electron microscope is used to characterize the magnetic microstructure of magnetotactic bacteria. The practical...

... coccoid organisms from the lagoon have been determined by electron holography. The results are consistent with single-magnetic-domain structure in the elongated magnetosomes from one organism and metastable, single-magnetic-domain structure in the larger, more equi-axed, magnetosomes from the other...

... error with estimates derived from magnetic hysteresis measurements. Magnetic hysteresis and low field susceptibility measurements combined with electron holography experiments indicate that all three samples behave superparamagnetically at room temperature, and show increasing levels of single domain...

... microscopy techniques, including electron holography, reveal the complex interplay between the physical and magnetic properties and biological functions of ferrimagnetic nanocrystals in bacteria. although some information is now available about magnetic sensory systems in more complex organisms, much further...

... of off-axis electron holography in the transmission electron microscope is presented by Dunin-Borkowski et al., and its use demonstrated by the determination of the magnetic microstructures of magnetite chains from magnetotactic bacteria (Dunin-Borkowski et al. and McCartney et al.). The possibility...

... as a result of what was being presented. The talk in question was by Mihály Pósfai, who had been awarded the 1999 European Mineralogical Union Medal for Research Excellence and was presenting his work of applying the technique of electron holography to directly image the magnetic state of magnetite...

...F igure 7 Magnetic phase contours from the region shown in Figure 6 , measured using electron holography. The outlines of the magnetite-rich regions are marked in white, while the direction of the measured magnetic induction is indicated both using arrows and according to the color wheel shown...

.... Philosophical Magazine A , 37 , 780 –812. Doyle, P.A. and Turner, P.S. ( 1968 ) Relativistic Hartree-Fock X-ray and electron scattering factors. Acta Crystallographica A , 24 , 390 –397. Dunin-Borkowski, R.E., McCartney, M.R., and Smith, D.J. ( 2004 ) Electron holography of nanostructured materials...

... to meet Rafal Dunin-Borkowski, whose expertise in the field of electron holography was producing incredible images of magnetic microstructures in patterned alloys. I immediately saw the potential of this technique for mineral magnetism, and together with Rafal was able to finally solve some...

... by Richard’s personal modesty and sense of humor. Richard has not shied away from developing and applying new techniques to the problems that he chooses and has had notable success in using electron holography to identify nanoscale magnetic interactions in exsolved magnetic systems, but also combining neutron...