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Phys Rev Lett. 2005 Feb 11;94(5):056602. Epub 2005 Feb 11.

Co1-xFexS2: a tunable source of highly spin-polarized electrons.

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1
Department of Chemical Engineering and Materials Science, University of Minnesota, USA.

Abstract

In the emerging field of spin-electronics ideal ferromagnetic electron sources would not only possess a high degree of spin polarization, but would also offer control over the magnitude of this polarization. We demonstrate here that a simple scheme can be utilized to control both the magnitude and the sign of the spin polarization of ferromagnetic CoS2, which we probe with a variety of techniques. The position of the Fermi level is fine-tuned by solid solution alloying with the isostructural diamagnetic semiconductor FeS2, leading to tunable spin polarization of up to 85%.

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