Chromium dioxide or chromium(IV) oxide is a synthetic magnetic substance once widely used in magnetic tape emulsion. Chromium (IV) oxide has a tetragonal unit cell with a rutile-type structure.
Among the magnetic materials being actively investigated for their potential use in such devices CrO2 is one of the most attractive because it is a halfmetal fully spin polarized at the Fermi level with a Curie temperature well above room temperature and a magnetic moment of 2 μB per formula unit.
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