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@INPROCEEDINGS{Ptter:278998,
      author       = {Pütter, Sabine and Geprägs, S. and Goennenwein, S. T. B.
                      and Gross, R.},
      title        = {{I}nfluence of the structural quality of {P}t on the spin
                      {H}all magnetoresistance in {P}t/{YIG} hybrids},
      reportid     = {FZJ-2015-07168},
      year         = {2015},
      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 ferrimagnet is
                      used. Thin films of platinum (Pt) grown on yttrium iron
                      garnet (Y3Fe5O12, YIG) often serve as prototype structures
                      [1-3]. Recently, the influence of the interface quality
                      between the two materials on the spin Hall effect came into
                      focus and the importance of a surface treatment of YIG was
                      discussed [3-7]. We present a systematic study of Pt thin
                      film growth on YIG single crystals. The YIG crystals were
                      exposed to different surface treatments prior to the Pt
                      deposition. Pt thin films were grown under UHV conditions at
                      different substrate temperatures by thermal evaporation
                      utilizing the JCNS molecular beam epitaxy system which is
                      also open to users in the framework of neutron experiments
                      performed at the MLZ (www.mlz-garching.de). Surface science
                      methods like in-situ Auger-electron-spectroscopy, reflection
                      high/low energy electron diffraction, ex-situ x-ray
                      reflectivity and atomic force microscopy were utilized for
                      sample quality control. The spin Hall magnetoresistance is
                      characterized via magnetization orientation dependent
                      resistance measurements in a superconducting magnet
                      cryostat. Best Pt growth results are achieved when the YIG
                      substrate is annealed prior to thin film growth. Growth at
                      room temperature yields higher film roughness while at
                      higher temperatures the risk of Pt oxidation increases. At
                      about 900°C substrate temperature interdiffusion takes
                      place. Optimum Pt thin film growth is found at about 500°C
                      where a texture of the Pt film is observed. In our
                      presentation we discuss the influence of the YIG crystal
                      surface treatment and different growth parameters on the
                      quality of the Pt films in detail and address their impact
                      on the spin Hall magnetoresistance effect.References[1] Sun
                      Y., Chang H., Kabatek M., Song Y.-Y., Wang Z. et al., Phys.
                      Rev. Lett. 111, 106601 (2013)[2] Nakayama H., Althammer M.,
                      Chen Y.-T., Uchida K., Kajiwara Y., et al., Phys. Rev. Lett.
                      110, 206601 (2013).[3] Weiler M., Althammer M., Czeschka F.
                      D., Huebl H., Wagner M. S. et al., Phys. Rev. Lett. 108,
                      106602 (2012).[4] Czeschka F. D., Dreher L., Brandt M. S.,
                      Weiler M., Althammer M. et al., Phys. Rev. Lett. 107, 046601
                      (2011).[5] Jungfleisch M. B., Lauer V., Neb R., Chumak A.
                      V., and Hillebrands B., Appl. Phys. Lett. 103, 022411
                      (2013).[6] Qiu Z., Ando K., Uchida K., Kajiwara Y.,
                      Takahashi R. et al., Appl. Phys. Lett. 103, 09404 (2013).[7]
                      Aqeel A., Vera-Marun I. J., van Wees B. M., and Palstra T.
                      T. M., J. Appl. Phys. 116, 15703 (2014).},
      month         = {Jul},
      date          = {2015-07-12},
      organization  = {22nd International Colloquium on
                       magnetic films and surfaces, Kraków
                       (Poland), 12 Jul 2015 - 17 Jul 2015},
      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)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)24},
      url          = {https://juser.fz-juelich.de/record/278998},
}