title: Co1-xFexS2: a tunable source of highly spin-polarized electrons.
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%.
authors.affiliation: Department of Chemical Engineering and Materials Science, University of Minnesota, USA.
authors.forename: L
authors.initials: L
authors.lastname: Wang
authors.forename: K
authors.initials: K
authors.lastname: Umemoto
authors.forename: R M
authors.initials: RM
authors.lastname: Wentzcovitch
authors.forename: T Y
authors.initials: TY
authors.lastname: Chen
authors.forename: C L
authors.initials: CL
authors.lastname: Chien
authors.forename: J G
authors.initials: JG
authors.lastname: Checkelsky
authors.forename: J C
authors.initials: JC
authors.lastname: Eckert
authors.forename: E D
authors.initials: ED
authors.lastname: Dahlberg
authors.forename: C
authors.initials: C
authors.lastname: Leighton