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@INPROCEEDINGS{SyedMohd:859558,
      author       = {Syed Mohd, Amir and Pütter, Sabine and Mattauch, Stefan
                      and Brückel, Thomas},
      title        = {{C}onnecting {MARIA} with the {MBE} system: {P}olarized
                      {N}eutron {R}eflectivity of thin {C}o films in {UHV}
                      conditions using portable transport chamber},
      reportid     = {FZJ-2019-00410},
      year         = {2017},
      abstract     = {MARIA is a dedicated instrument for neutron reflectometry
                      of thin films. However, due to limited space a UHV system
                      for thin film growth and in-situ measurements cannot be
                      placed on-site. Hence, up to now thin films which are
                      sensitive to ambient air have been fabricated in the MBE
                      system located in the thin film laboratory nearby and were
                      covered by protecting cap layers in-situ. However these
                      layers may change the physical properties of the sample,
                      which is undesirable and prevents from further manipulation
                      of the sample.Recently, we have solved this problem by
                      developing a handy mini UHV transport chamber which is
                      capable for both, sample transfer and polarized neutron
                      reflectivity (PNR) measurements in UHV [1]. Our solution
                      consists of a DN CF-40 cube with two opposing sapphire
                      windows for the neutron beam, a combined non evaporable
                      getter and ion pump for keeping the vacuum, a wobble stick,
                      which is needed for in-situ sample transfer and also serves
                      as sample holder for samples of up to 1 cm2 and a valve for
                      sample exchange by mounting the chamber on the MBE system.
                      The pressure in the transfer chamber is kept in the 10−10
                      mbar range during transport and PNR measurement.In this
                      work, we present PNR of Co thin films with varying thickness
                      deposited on Pt buffered MgO(001) substrates. The samples
                      were prepared in the MBE and measured at MARIA under UHV
                      condition using transport chamber at room temperature.
                      During the measurement a field of 100 mT was applied
                      parallel to the sample surface. We found that Co thin film
                      is magnetically dead below 5 nm. However, magnetic moment in
                      Co thin films evolves with increasing thickness and
                      approaches to the bulk value (1.7 μB) above 3 nm. In
                      addition, we also measured PNR of Co thin films after
                      exposing with the ambient air. The fitting of the PNR data
                      shows that surface of the Co film gets oxidised in air but
                      remains free from contamination in UHV transport
                      chamber.This project is part of the nanoscience foundry and
                      fine analysis project (NFFA, www.nffa.eu) and has received
                      funding from the EU’s H2020 research and innovation
                      programme under grant agreement N. 654360.[1] A. Syed Mohd
                      et al., Rev. Sci. Instrum., 87, 123909 (2016).},
      month         = {Oct},
      date          = {2017-10-10},
      organization  = {JCNS Workshop: Trends and Perspectives
                       in Neutron Instrumentation: Probing
                       Structure and Dynamics at Interfaces
                       and Surfaces, Tutzing (Germany), 10 Oct
                       2017 - 13 Oct 2017},
      subtyp        = {After Call},
      cin          = {JCNS-FRM-II / PGI-4 / JCNS-2},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)PGI-4-20110106 / I:(DE-Juel1)JCNS-2-20110106},
      pnm          = {6212 - Quantum Condensed Matter: Magnetism,
                      Superconductivity (POF3-621) / 6G4 - Jülich Centre for
                      Neutron Research (JCNS) (POF3-623) / 6G15 - FRM II / MLZ
                      (POF3-6G15) / 524 - Controlling Collective States
                      (POF3-524)},
      pid          = {G:(DE-HGF)POF3-6212 / G:(DE-HGF)POF3-6G4 /
                      G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-524},
      experiment   = {EXP:(DE-MLZ)MBE-MLZ-20151210 / EXP:(DE-MLZ)MARIA-20140101},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/859558},
}