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@INPROCEEDINGS{Ptter:811991,
      author       = {Pütter, Sabine and Geprägs, Stephan and Schlitz, Richard
                      and Ganzhorn, Katrin and Opel, Matthias and Erb, Andreas and
                      Goennenwein, Sebastian T. B. and Wilhelm, F. and Rogalev, A.
                      and Gross, Rudolf},
      title        = {{I}mpact of the interface quality on the spin {H}all
                      magnetoresistance in {P}t/{YIG} hybrids},
      reportid     = {FZJ-2016-04292},
      year         = {2016},
      abstract     = {For the generation and detection of pure spin currents via
                      the (inverse) spin Hall effect, a combination of a
                      non-ferromagnetic metal and an insulating magnet is
                      required. In this context platinum (Pt) thin films grown on
                      yttrium iron garnet (Y3Fe5O12, YIG) serve as prototype
                      structures [1-3]. Recently, the influence of the Pt/YIG
                      interface quality on the spin Hall effect came into focus
                      and the importance of improving the surface quality of YIG
                      was discussed [4-6].We present a systematic study of Pt thin
                      film growth on YIG single crystals correlating the interface
                      quality of the Pt/YIG bilayers to spin Hall
                      magnetoresistance (SMR) measurements. Prior to the Pt
                      deposition, which was carried out by thermal evaporation
                      under UHV conditions, YIG crystals were exposed to different
                      surface treatments. The sample quality was controlled
                      in-situ by Auger-electron- spectroscopy, reflection high/low
                      energy electron diffraction as well as ex-situ by X- ray
                      reflectivity and atomic force microscopy.Best Pt thin films
                      were achieved using YIG crystals treated with Piranha
                      solution followed by annealing in oxygen prior to the thin
                      film growth. In these samples a SMR value of about 4·10-4
                      was achieved, which is close to the SMR effect of respective
                      Pt/YIG samples with in-situ interfaces [3]. Growing Pt thin
                      films at higher temperature increases the thin film
                      roughness as well as the interdiffusion of Pt and YIG.
                      However, by utilizing X-ray magnetic circular dichroism, no
                      induced magnetic moment could be detected neither in Pt thin
                      films on YIG substrates fabricated at room temperature nor
                      at 500°C. This result is in agreement with earlier
                      measurements on Pt/YIG thin films [7].References[1] H.
                      Nakayama et al., Phys. Rev. Lett. 110, 206601 (2013)[2] Y.
                      Sun et al., Phys. Rev. Lett. 111, 106601 (2013)[3] M.
                      Althammer et al., Phys. Rev. B 87, 224401 (2013)[4] M. B.
                      Jungfleisch et al., Appl. Phys. Lett. 103, 022411 (2013)[5]
                      Z. Qiu, et al., Appl. Phys. Lett. 103, 09404 (2013)[6] A.
                      Aqeel et al., J. Appl. Phys. 116, 15703 (2014).[7] S.
                      Geprägs, et al., Appl. Phys. Lett. 101, 262407 (2012).},
      month         = {Jun},
      date          = {2016-06-19},
      organization  = {9th International Symposium on
                       Metallic Multilayersh, Uppsala
                       (Sweden), 19 Jun 2016 - 23 Jun 2016},
      subtyp        = {After Call},
      cin          = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
                      (München) ; JCNS-FRM-II / JCNS-2},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106},
      pnm          = {524 - Controlling Collective States (POF3-524) / 6212 -
                      Quantum Condensed Matter: Magnetism, Superconductivity
                      (POF3-621) / 6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich
                      Centre for Neutron Research (JCNS) (POF3-623)},
      pid          = {G:(DE-HGF)POF3-524 / G:(DE-HGF)POF3-6212 /
                      G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-6G4},
      experiment   = {EXP:(DE-MLZ)MBE-MLZ-20151210},
      typ          = {PUB:(DE-HGF)24},
      url          = {https://juser.fz-juelich.de/record/811991},
}