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000877875 1001_ $$0P:(DE-HGF)0$$aDrögeler, Marc$$b0
000877875 245__ $$aSimulations on the Influence of Spatially Varying Spin Transport Parameters on the Measured Spin Lifetime in Graphene Non-Local Spin Valves
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000877875 520__ $$aSpin transport properties of graphene non‐local spin valve devices are typically determined from Hanle spin precession measurements by using a simplified solution of the one‐dimensional Bloch‐Torrey equation which assumes infinitely long transport channels and uniform spin transport parameter. We investigate the effects of a finite graphene size and explore the influence of spatially‐varying transport parameters on the measured Hanle curves by finite element simulations. We assume enhanced spin dephasing in the contact‐covered graphene areas with additional Fermi level pinning and explore the influence of non‐magnetic reference electrodes which are not properly decoupled from graphene. In experiments, it is typically observed that the spin lifetime increases with increasing charge carrier density. None of our simulations can reproduce this trend indicating that this dependency originates from spin transport through graphene areas which are not covered by contacts. We find that the extracted spin lifetime might be overestimated in flakes which are shorter than the spin diffusion length. Moreover, contact‐induced spin dephasing leads to an overall reduction of the extracted spin lifetime. Additionally, we show that non‐magnetic reference electrodes may also influence the measured spin lifetime even though they are not part of the transport area under investigation.
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000877875 7001_ $$0P:(DE-HGF)0$$aVolmer, Frank$$b1
000877875 7001_ $$0P:(DE-Juel1)180322$$aStampfer, Christoph$$b2
000877875 7001_ $$0P:(DE-Juel1)178028$$aBeschoten, Bernd$$b3$$eCorresponding author$$ufzj
000877875 773__ $$0PERI:(DE-600)1481096-7$$a10.1002/pssb.201700293$$gVol. 254, no. 11, p. 1700293 -$$n11$$p1700293 -$$tPhysica status solidi / B Basic research$$v254$$x0370-1972$$y2017
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000877875 8564_ $$uhttps://juser.fz-juelich.de/record/877875/files/1706.09807.pdf$$yPublished on 2017-08-08. Available in OpenAccess from 2018-08-08.
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