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Issue 3, 2015
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On-chip magnetometer for characterization of superparamagnetic nanoparticles

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Abstract

An on-chip magnetometer was fabricated by integrating a planar Hall magnetoresistive (PHR) sensor with microfluidic channels. The measured in-plane field sensitivities of an integrated PHR sensor with NiFe/Cu/IrMn trilayer structure were extremely high at 8.5 μV Oe−1. The PHR signals were monitored during the oscillation of 35 pL droplets of magnetic nanoparticles, and reversed profiles for the positive and negative z-fields were measured, where magnitudes increased with the applied z-field strength. The measured PHR signals for 35 pL droplets of magnetic nanoparticles versus applied z-fields showed excellent agreement with magnetization curves measured by a vibrating sample magnetometer (VSM) of 3 μL volume, where a PHR voltage of 1 μV change is equivalent to 0.309 emu cc−1 of the volume magnetization with a magnetic moment resolution of ~10−10 emu.

Graphical abstract: On-chip magnetometer for characterization of superparamagnetic nanoparticles

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Publication details

The article was received on 13 Sep 2014, accepted on 14 Nov 2014 and first published on 14 Nov 2014


Article type: Paper
DOI: 10.1039/C4LC01076K
Citation: Lab Chip, 2015,15, 696-703
  • Open access: Creative Commons BY-NC license
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    On-chip magnetometer for characterization of superparamagnetic nanoparticles

    K. W. Kim, V. Reddy, S. R. Torati, X. H. Hu, A. Sandhu and C. G. Kim, Lab Chip, 2015, 15, 696
    DOI: 10.1039/C4LC01076K

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