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