Critical single-domain grain sizes in elongated iron particles: implications for meteoritic and lunar magnetism

Critical superparamagnetic/single-domain grain sizes in interacting magnetite particles: implications for magnetosome crystals.

Magnetotactic bacteria contain chains of magnetically interacting crystals (magnetosome crystals), which they use for navigation (magnetotaxis). To improve magnetotaxis efficiency, the magnetosome crystals (usually magnetite or greigite in composition) should be magnetically stable single-domain (SSD) particles. Smaller single-domain particles become magnetically unstable owing to thermal fluct...

Iron Isotope Composition of the Lunar Mare Regolith: Implications for Isotopic Fractionation during Production of Single Domain Iron Metal

Introduction: The processes of space weathering are dominant in the development of the regolith and soils on all airless bodies in the Solar System. Indeed, it is this processing of the soil that complicates and masks the effective use of remote sensing by spectral reflectance [12]. The lunar regolith provides us with invaluable samples to study these effects of space weathering. In particular,...

Tracking single particles and elongated filaments with nanometer precision.

Recent developments in image processing have greatly advanced our understanding of biomolecular processes in vitro and in vivo. In particular, using Gaussian models to fit the intensity profiles of nanometer-sized objects have enabled their two-dimensional localization with a precision in the one-nanometer range. Here, we present an algorithm to precisely localize curved filaments whose structu...

Chemical individuality of lunar, meteoritic, and terrestrial silicate rocks.

Magnetotransport properties of CrO2 films down to single-grain sizes