Abstract
Electronic structures of ( Fe 1 - x Co x ) Si with a B20-type structure are calculated by the linear muffin-tin orbital method with the atomic sphere approximation. It has been shown that the excess 3d electrons on replaced Co atom for x < 0.5 occupy only the majority spin band and the Fermi level lies still in the band gap of the minority spin band. This is consistent with the observed concentration dependence of the spontaneous magnetization at small x. This fact means that the present system may be a ferromagnetic half metal.
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