Scientists have discovered that the magnetic strength of magnetite-the most abundant magnetic mineral on Earth-declines drastically when put under pressure. Researchers from the Carnegie Institution's Geophysical Laboratory, together with colleagues at the Advanced Photon Source of Argonne National Laboratory, have found that when magnetite is subjected to pressures between 120,000 and 160,000 times atmospheric pressure its magnetic strength declines by half. They discovered that the change is due to what is called electron spin pairing.
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