Efficient spin injection and giant magnetoresistance in Fe / MoS 2 / Fe junctions

Kapildeb Dolui, Awadhesh Narayan, Ivan Rungger, Stefano Sanvito

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Abstract

We demonstrate giant magnetoresistance in Fe/MoS2/Fe junctions by means of ab initio transport calculations. We show that junctions incorporating either a monolayer or a bilayer of MoS2 are metallic and that Fe acts as an efficient spin injector into MoS2 with an efficiency of about 45%. This is the result of the strong coupling between the Fe and S atoms at the interface. For junctions of greater thickness, a maximum magnetoresistance of ∼300% is obtained, which remains robust with the applied bias as long as transport is in the tunneling limit. A general recipe for improving the magnetoresistance in spin valves incorporating layered transition metal dichalcogenides is proposed. © 2014 American Physical Society.
Original languageEnglish (US)
JournalPhysical Review B
Volume90
Issue number4
DOIs
StatePublished - Jul 2 2014
Externally publishedYes

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work is supported by Science Foundation of Ireland (AMBER center) and by the Irish Research Council (A.N.). I.R. acknowledges financial support from the King Abdullah University of Science and Technology (ACRAB project). We thank Trinity Centre for High Performance Computing (TCHPC) and Irish Centre for High-End Computing (ICHEC) for providing the computational resources. K.D., A.N., and I.R. contributed equally to this work.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.

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