Science, Space and Technology News 2024
Researchers analyzed samples from asteroid Ryugu, collected by the Hayabusa2 spacecraft, revealing new insights into space weathering and magnetic properties. Credit: Yuki Kimura
Magnetite particles cut from a Ryugu sample. Bright field transmission electron microscopy image. Magnetic flux distribution image obtained by electron holography. The concentric circular stripes seen inside the particles correspond to magnetic lines of force. They are called vortex magnetic domain structures and are more stable than ordinary hard disks, which can record magnetic fields for more than 4.6 billion years. Credit: Yuki Kimura, et al. Nature Communications.
Iron nanoparticles distributed around pseudo-magnetite. Dark-field image taken with a scanning transmission electron microscope. Corresponding iron distribution image. White arrows indicate iron nanoparticles. Magnetic flux distribution image of the central region of A and B. No magnetic field lines can be seen in the pseudo-magnetite, whereas concentric vortex-like magnetic domain structures can be seen inside the iron particles as shown by black arrows. Credit: Yuki Kimura, et al.
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