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@ARTICLE{Engelmann:910817,
      author       = {Engelmann, Ulrich M. and Pourshahidi, Ali Mohammad and
                      Shalaby, Ahmed and Krause, Hans-Joachim},
      title        = {{P}robing particle size dependency of frequency mixing
                      magnetic detection with dynamic relaxation simulation},
      journal      = {Journal of magnetism and magnetic materials},
      volume       = {563},
      issn         = {0304-8853},
      address      = {Amsterdam},
      publisher    = {North-Holland Publ. Co.},
      reportid     = {FZJ-2022-04167},
      pages        = {169965 -},
      year         = {2022},
      abstract     = {Biomedical applications of magnetic nanoparticles (MNP)
                      fundamentally rely on the particles’ magnetic relaxation
                      as a response to an alternating magnetic field. The magnetic
                      relaxation complexly depends on the interplay of MNP
                      magnetic and physical properties with the applied field
                      parameters. It is commonly accepted that particle core size
                      is a major contributor to signal generation in all the above
                      applications, however, most MNP samples comprise broad
                      distribution spanning 10 nm and more. Therefore, precise
                      knowledge of the exact contribution of individual core sizes
                      to signal generation is desired for optimal MNP design
                      generally for each application. Specifically, we present a
                      magnetic relaxation simulation-driven analysis of
                      experimental frequency mixing magnetic detection (FMMD) for
                      biosensing to quantify the contributions of individual core
                      size fractions towards signal generation. Applying our
                      method to two different experimental MNP systems, we found
                      the most dominant contributions from approx. 20 nm sized
                      particles in the two independent MNP systems. Additional
                      comparison between freely suspended and immobilized MNP also
                      reveals insight in the MNP microstructure, allowing to use
                      FMMD for MNP characterization, as well as to further
                      fine-tune its applicability in biosensing.},
      cin          = {IBI-3},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IBI-3-20200312},
      pnm          = {5241 - Molecular Information Processing in Cellular Systems
                      (POF4-524)},
      pid          = {G:(DE-HGF)POF4-5241},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000871107000004},
      doi          = {10.1016/j.jmmm.2022.169965},
      url          = {https://juser.fz-juelich.de/record/910817},
}