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Image: Nina Bordeaux, Northeastern University
The magnetic structure in the mineral tetrataenite, which is only found naturally in meteorites that have undergone extremely slow cooling of approximately 0.3 degrees Kelvin per million years. The magnetic structure indicates that tetrataenite is a permanent magnet material but it has never been synthesized in bulk on Earth. This image (10 x 10 microns) was obtained using magnetic force microscope.