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June 2012
Volume 65, Issue 6
cover: Microscopic crystals of magnetite—the most strongly magnetic mineral in nature—are the dominant carriers of remanent magnetization in rocks. A transmission electron microscopy technique known as electron holography can reveal the complexity of that magnetization, as shown in this half-micron-wide image. Arrows indicate the direction of the magnetic field component parallel to the sample’s surface; magnetite-rich regions are outlined in white. For details and the broader story of using a rock’s magnetic memory to discern aspects of planetary history, see the article by David Dunlop on page 31. (Image courtesy of Richard Harrison, University of Cambridge.)
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