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@ARTICLE{Drgeler:877875,
      author       = {Drögeler, Marc and Volmer, Frank and Stampfer, Christoph
                      and Beschoten, Bernd},
      title        = {{S}imulations on the {I}nfluence of {S}patially {V}arying
                      {S}pin {T}ransport {P}arameters on the {M}easured {S}pin
                      {L}ifetime in {G}raphene {N}on-{L}ocal {S}pin {V}alves},
      journal      = {Physica status solidi / B Basic research},
      volume       = {254},
      number       = {11},
      issn         = {0370-1972},
      address      = {Weinheim},
      publisher    = {Wiley-VCH},
      reportid     = {FZJ-2020-02486},
      pages        = {1700293 -},
      year         = {2017},
      abstract     = {Spin 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.},
      cin          = {PGI-9 / JARA-FIT},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-9-20110106 / $I:(DE-82)080009_20140620$},
      pnm          = {522 - Controlling Spin-Based Phenomena (POF3-522)},
      pid          = {G:(DE-HGF)POF3-522},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000417609800019},
      doi          = {10.1002/pssb.201700293},
      url          = {https://juser.fz-juelich.de/record/877875},
}