Magnetic microstructure of magnetotactic bacteria by electron holography

被引：329

作者：

Dunin-Borkowski, RE ^{[1
]}

McCartney, MR

Frankel, RB

Bazylinski, DA

Posfai, M

Buseck, PR

机构：

[1] Arizona State Univ, Ctr Solid State Sci, Tempe, AZ 85287 USA

[2] Calif Polytech State Univ San Luis Obispo, Dept Phys, San Luis Obispo, CA 93407 USA

[3] Iowa State Univ, Dept Microbiol, Ames, IA 50011 USA

[4] Arizona State Univ, Dept Geol, Tempe, AZ 85287 USA

[5] Arizona State Univ, Dept Chem Biochem, Tempe, AZ 85287 USA

来源：

SCIENCE | 1998年 / 282卷 / 5395期

关键词：

D O I：

10.1126/science.282.5395.1868

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页码：1868 / 1870

页数：3

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