26 September 2013 A systematic approach to interpreting Hanle spin precession data in non-local spin valves
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Graphene's two dimensional nature and high surface sensitivity have led to fascinating predictions regarding induced spin-based phenomena through careful control of adsorbates on the graphene surface, including the extrinsic spin Hall effect, band gap opening, and induced magnetism. By taking advantage of atomic scale control provided by MBE, we have investigated submonolayer deposition of adsorbates and their interactions with graphene. Spin transport measurements performed in-situ during systematic introduction of atomic hydrogen demonstrated that hydrogen adsorbed on graphene forms magnetic moments that couple via exchange to the injected spin current. The effects of induced magnetic moments are evident in the non-local magnetoresistance and Hanle spin precession. Exchange coupling between the injected spin current and the induced moments impact the Hanle curves through an effective exchange field leading to new interpretations of Hanle spin precession data and analysis. Here we present a simple procedure in which Hanle curves can be reliably interpreted.
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Adrian G. Swartz, Adrian G. Swartz, Kathleen M. McCreary, Kathleen M. McCreary, Wei Han, Wei Han, Hua Wen, Hua Wen, Roland K. Kawakami, Roland K. Kawakami, "A systematic approach to interpreting Hanle spin precession data in non-local spin valves", Proc. SPIE 8813, Spintronics VI, 881328 (26 September 2013); doi: 10.1117/12.2022782; https://doi.org/10.1117/12.2022782

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