Spin-dependent intergranular transport in highly spin-polarized Co 1-x Fex S2 thin films

M. Manno; R. Frakie; B. Bolon; C. Leighton

doi:10.1063/1.3262958

Spin-dependent intergranular transport in highly spin-polarized Co _1-x Fe_x S₂ thin films

M. Manno, R. Frakie, B. Bolon, C. Leighton

Chemical Engineering and Materials Science

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

Magnetic and magnetotransport measurements on polycrystalline thin film Co_1-x Fe_x S₂, a system that exhibits tunable conduction electron spin polarization in bulk, are reported. The films exhibit a low field hysteretic magnetoresistance (MR) due to spin-dependent intergranular tunneling, thus providing a simple probe of the spin polarization. The MR increases rapidly with x, saturating as the magnetization reaches 1.0 _μB/Co, demonstrating that high, doping tunable, spin polarization can be readily achieved in thin films synthesized by simple methods. Quantitative estimates yield spin polarizations as high as 90%.

Original language	English (US)
Article number	182510
Journal	Applied Physics Letters
Volume	95
Issue number	18
DOIs	https://doi.org/10.1063/1.3262958
State	Published - 2009

Bibliographical note

Funding Information:
Work supported primarily by the NSF MRSEC (Grant No. DMR-0212302 and DMR-0819885). We thank T. Stefanek, M. Sharma, M. Torija, and M. Erickson for discussions and assistance.

Copyright:
Copyright 2009 Elsevier B.V., All rights reserved.

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abstract = "Magnetic and magnetotransport measurements on polycrystalline thin film Co1-x Fex S2, a system that exhibits tunable conduction electron spin polarization in bulk, are reported. The films exhibit a low field hysteretic magnetoresistance (MR) due to spin-dependent intergranular tunneling, thus providing a simple probe of the spin polarization. The MR increases rapidly with x, saturating as the magnetization reaches 1.0 μB/Co, demonstrating that high, doping tunable, spin polarization can be readily achieved in thin films synthesized by simple methods. Quantitative estimates yield spin polarizations as high as 90%.",

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AU - Leighton, C.

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AB - Magnetic and magnetotransport measurements on polycrystalline thin film Co1-x Fex S2, a system that exhibits tunable conduction electron spin polarization in bulk, are reported. The films exhibit a low field hysteretic magnetoresistance (MR) due to spin-dependent intergranular tunneling, thus providing a simple probe of the spin polarization. The MR increases rapidly with x, saturating as the magnetization reaches 1.0 μB/Co, demonstrating that high, doping tunable, spin polarization can be readily achieved in thin films synthesized by simple methods. Quantitative estimates yield spin polarizations as high as 90%.

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