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@ARTICLE{Krause:57200,
      author       = {Krause, H.-J. and Wolters, N. and Zhang, Y. and
                      Offenhäusser, A. and Miethe, P. and Meyer, M. H. F. and
                      Hartmann, M. and Keusgen, M.},
      title        = {{M}agnetic particle detection by frequency mixing for
                      immunoassay applications},
      journal      = {Journal of magnetism and magnetic materials},
      volume       = {311},
      issn         = {0304-8853},
      address      = {Amsterdam},
      publisher    = {North-Holland Publ. Co.},
      reportid     = {PreJuSER-57200},
      pages        = {436 - 444},
      year         = {2007},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {For magnetic immunoassay applications, a novel magnetic
                      reader for quantification of magnetic particle
                      concentrations has been developed. Upon magnetic excitation
                      at two distinct frequencies incident on the sample, the
                      response signal generated at a sum frequency is detected.
                      The low-frequency field component periodically drives the
                      magnetic particles into saturation, which is probed by the
                      high-frequency field. The appearance of frequency mixing
                      lines is highly specific to the nonlinearity of the
                      superparamagnetic particles' magnetization. The optimization
                      of field coils, differential pickup coil, preamplifier,
                      demodulators and filters are discussed. The output signal is
                      linear for four orders of magnitude in iron concentration.
                      (C) 2006 Elsevier B.V. All rights reserved.},
      keywords     = {J (WoSType)},
      cin          = {CNI / IBN-2 / JARA-FIT},
      ddc          = {530},
      cid          = {I:(DE-Juel1)VDB381 / I:(DE-Juel1)IBN-2-20090406 /
                      $I:(DE-82)080009_20140620$},
      pnm          = {Grundlagen für zukünftige Informationstechnologien},
      pid          = {G:(DE-Juel1)FUEK412},
      shelfmark    = {Materials Science, Multidisciplinary / Physics, Condensed
                      Matter},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000245524800088},
      doi          = {10.1016/j.jmmm.2006.10.1164},
      url          = {https://juser.fz-juelich.de/record/57200},
}