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Magnetic microstructure of bacterial magnetite by electron holography

¹ Center for Solid State Science, Arizona State University, P.O. Box 871704, Tempe, AZ 85287–1704, Arizona, USA. e-mail: molly.mccartney@asu.edu
² Instituto de Microbiologia Professor Paulo de GoAes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
³ Instituto de CieCncias BiomeAdicas, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
⁴ Departments of Geological Sciences and Chemistry/Biochemistry, Arizona State University, Tempe, Arizona, USA
⁵ Department of Physics, California Polytechnic State University, San Luis Obispo, California, USA. e-mail: rfrankel@calpoly.edu

This paper was presented at the "Biogenic Iron Minerals" symposium held in Tihany, Hungary (May 2000)

A brackish lagoon at Itaipu, Brazil, contains magnetotactic bacteria with unusually large magnetite magnetosomes (lengths 100–200 nm). The micromagnetic structures of the magnetosomes from two different 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 organism. The results are consistent with theoretical predictions of the transition dimension between stable and metastable single-domain structure in magnetite.

Key-words: magnetite, magnetotactic bacteria, electron holography, magnetic microstructure, single-magnetic domain.

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