Magnetic microstructure of bacterial magnetite by electron holography

Martha McCartney, U. Lins, M. Farina, P R Buseck, R. B. Frankel

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)685-689
Number of pages5
JournalEuropean Journal of Mineralogy
Volume13
Issue number4
DOIs
StatePublished - 2001

Keywords

  • Electron holography
  • Magnetic microstructure
  • Magnetite
  • Magnetotactic bacteria
  • Single-magnetic domain

ASJC Scopus subject areas

  • Geochemistry and Petrology

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