利用电子全息术研究趋磁细菌的磁微结构
Magnetic microstructure of magnetotactic bacteria by electron holography.
作者信息
Dunin-Borkowski RE, McCartney MR, Frankel RB, Bazylinski DA, Posfai M, Buseck PR
机构信息
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.
出版信息
Science. 1998 Dec 4;282(5395):1868-70. doi: 10.1126/science.282.5395.1868.
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.
利用透射电子显微镜中的离轴电子全息术来关联趋磁细菌中磁铁矿纳米晶体的物理和磁微结构。磁铁矿晶体均为单磁畴，链中较小的超顺磁性晶体的磁化方向受到与较大晶体的磁相互作用的限制。在细长晶体中发现形状各向异性主导磁晶各向异性。确定了一条链的矫顽力在300至450奥斯特之间。
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