Postprint version. Published in Hyperfine Interactions, Volume 151-152, Issue 1-4, December 1, 2003, pages 145-153. Copyright © 2003 Springer. The original publication is available at http://dx.doi.org/ 10.1023/B:HYPE.0000020407.25316.c3.
Magnetotactic bacteria orient and migrate along magnetic field lines. Each cell is essentially a self-propelled magnetic dipole. The magnetic properties of these bacteria have been determined by a variety of techniques, including pulsed hysteresis measurements on single cells.