Electronics & Telecommunication Research Institute (ETRI) 1 article published in JoVE Engineering Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples Hyobong Hong1, Eul-Gyoon Lim2, Jae-chan Jeong1, Jiho Chang1, Sung-Woong Shin2, Hans-Joachim Krause3 1Advanced Vision System Research Section, Electronics & Telecommunication Research Institute (ETRI), 2Intelligent Cognitive Technology Research Department, Electronics & Telecommunication Research Institute (ETRI), 3Peter Grünberg Institute (PGI-8), Forschungszentrum Jülich A scanner for imaging magnetic particles in planar samples was developed using the planar frequency mixing magnetic detection technique. The magnetic intermodulation product response from the nonlinear nonhysteretic magnetization of the particles is recorded upon a two-frequency excitation. It can be used to take 2D images of thin biological samples.