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Towards Spin Injection in Graphene by the Use of an MoS2 Tunnel Barrier.

Reinders, F. (2015) Towards Spin Injection in Graphene by the Use of an MoS2 Tunnel Barrier. Bachelor's Thesis, Physics.

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In this thesis, we focused on a novel device that uses materials beyond those conventionally used to study spin transport in graphene. For this, we used two dimensional materials that are structurally compatible with graphene and have tunable electronic transport properties. The basic objective was to tune the contacts so as to achieve efficient tunneling transport into graphene. One key material used in this direction is the metal transition dichalcogenide MoS2, due its relative ease in preparation and characterisation. In this work we describe the design and fabrication of a multilayer stack that uses MoS2 as a tunnel barrier for injecting spins into graphene from a ferromagnetic electrode such as cobalt. Tuning of the electronic properties is done by the application of a back gate. Ultimately, however, spin injection was not found, and results showed that the MoS2 functioned as transport channel instead of tunnel barrier. Our recommendations for further research would be to bring additional contacts directly onto the graphene channel, whereas our devices had only contacts directly on MoS2. This could promote the use of MoS2 as a tunnel barrier instead of lateral transport through the MoS2.

Item Type: Thesis (Bachelor's Thesis)
Degree programme: Physics
Thesis type: Bachelor's Thesis
Language: English
Date Deposited: 15 Feb 2018 08:05
Last Modified: 15 Feb 2018 08:05

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