4.5 Article

Inkjet-printed Mn-Zn ferrite nanoparticle core for fluxgate

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ELSEVIER
DOI: 10.1016/j.jmmm.2022.170003

Keywords

Fluxgate; Soft magnetic nanoparticles; Inkjet printing; Flexible magnetic sensor; Additive manufacturing

Funding

  1. Czech Science Foundation
  2. Grant Agency of the Czech Republic (GACR) [LM2018096]
  3. Czech Research Infrastructures [GA20-27150S]

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This article reports a novel non-planar fluxgate sensor based on inkjet-printed magnetic ink. The sensor features a wide open-loop linear range and relatively high sensitivity, meeting the requirements of electric current, position, and torque transducers.
Non-planar fluxgate sensors measuring the magnetic fields in the mu T range are required for electric current, position, and torque transducers. We report the first sensor based on an inkjet-printed 17 mm diameter ring core. The sensor wide open-loop linear range of +/- 1.5 mT allows to operate it without feedback. We describe the preparation of the very stable magnetic ink based on citrate-stabilized 13 nm diameter Mn-Zn ferrite nanoparticles that occur in superparamagnetic regime at room temperature. By printing 100 layers the total thickness of the inkjet-printed core was 2.2 mu m. The achieved sensitivity was 10 mV/mT for 25 kHz excitation frequency.

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