Co1-xFexS2: Albnable source of highly spin-polarized electrons

L. Wang, K. Umemoto, R. M. Wentzcovitch, T. Y. Chen, C. L. Chien, J. G. Checkelsky, J. C. Eckert, E. D. Dahlberg, C. Leighton

Research output: Contribution to journalArticlepeer-review

65 Scopus citations

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 FeS 2, leading to tunable spin polarization of up to 85%.

Original languageEnglish (US)
Article number056602
JournalPhysical Review Letters
Volume94
Issue number5
DOIs
StatePublished - Feb 11 2005

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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