Journal
EARTH AND PLANETARY SCIENCE LETTERS
Volume 297, Issue 1-2, Pages 10-17Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.epsl.2010.05.004
Keywords
magnetite; Verwey transition; twins; domain walls; TEM; electron holography
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Funding
- European Science Foundation (ESF) through European Commission through NERC [ERAS-CT-2003-980409, NE/D002036/1]
- Natural Environment Research Council [NE/D522203/1, NE/D002036/1] Funding Source: researchfish
- NERC [NE/D002036/1, NE/D522203/1] Funding Source: UKRI
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The magnetic behaviour of magnetite at low temperatures is dominated by its transformation to a monoclinic crystal structure that is simultaneously ferrimagnetic, ferroelastic and ferroelectric below similar to 125 K (the Verwey transition). Here we use electron microscopy to reveal the relationship between ferrimagnetic and ferroelastic domain structures in monoclinic magnetite. We present dynamic observations of magnetite during heating and cooling across the Verwey transition, revealing a diversity of unexpected interaction phenomena between crystallographic twins and magnetic domain walls. This study provides a new understanding of the low-temperature magnetic properties of magnetite that will affect a broad range of rock magnetic studies, from the interpretation of magnetic remanence in terrestrial rocks and sediments to the search for biogenic magnetite in extraterrestrial materials. (C) 2010 Elsevier B.V. All rights reserved.
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