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@ARTICLE{Morawski:10294,
      author       = {Morawski, I. and Voigtländer, B.},
      title        = {{S}imultaneously measured signals in scanning probe
                      microscopy with a needle sensor: {F}requency shift and
                      tunneling current},
      journal      = {Review of scientific instruments},
      volume       = {81},
      issn         = {0034-6748},
      address      = {[S.l.]},
      publisher    = {American Institute of Physics},
      reportid     = {PreJuSER-10294},
      pages        = {033703},
      year         = {2010},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {We present combined noncontact scanning force microscopy
                      and tunneling current images of a platinum(111) surface
                      obtained by means of a 1 MHz quartz needle sensor. The
                      low-frequency circuit of the tunneling current was combined
                      with a high-frequency signal of the quartz resonator
                      enabling full electrical operation of the sensor. The
                      frequency shift and the tunneling current were detected
                      simultaneously, while the feedback control loop of the
                      topography signal was fed using one of them. In both cases,
                      the free signal that was not connected to the feedback loop
                      reveals proportional-integral controller errorlike behavior,
                      which is governed by the time derivative of the topography
                      signal. A procedure is proposed for determining the
                      mechanical oscillation amplitude by utilizing the tunneling
                      current also including the average tip-sample work
                      function.},
      keywords     = {J (WoSType)},
      cin          = {IBN-3 / JARA-FIT},
      ddc          = {530},
      cid          = {I:(DE-Juel1)VDB801 / $I:(DE-82)080009_20140620$},
      pnm          = {Kondensierte Materie},
      pid          = {G:(DE-Juel1)FUEK414},
      shelfmark    = {Instruments $\&$ Instrumentation / Physics, Applied},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:20370181},
      UT           = {WOS:000276210200029},
      doi          = {10.1063/1.3321437},
      url          = {https://juser.fz-juelich.de/record/10294},
}