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Optimization of the coupling between piezoresistivity and magnetoelasticity in an elastomagnetic composite to sense a spatial gradient of the magnetic field

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Abstract

Elastomagnetic samples made of quasi-ellipsoidal nickel microparticles separated by a thin silicone layer were produced. A static magnetic field was applied during the process of sample solidification, obtaining a preferred orientation of the particles major axis through the coupling of the magnetic moment with the easy magnetization axis. The influence of the particle pre-orientation on the elasticity, piezoresistivity and magneto-piezoresistivity were investigated and discussed in order to maximize the resistance change due to a moderate magnetic field gradient, in view of conceiving an innovative core material for sensor devices. It was shown as the relative change of resistance induced by a low magnetic field gradient can be improved of over 15% in comparison with previous results, approaching an absolute value of the magneto-piezoresistive ratio equal to 80%. Since a local magnetic field change can be also produced by a displacement of a magnetic body, in perspective the effect can be applied for sensing position or mechanical vibration too.

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Authors and Affiliations

  1. CNR-SPIN, Department of Physical Sciences, Federico II University of Naples, p.le V.Tecchio 80, 80125, Naples, Italy

    Giovanni Ausanio, Vincenzo Iannotti & Luciano Lanotte

  2. Department of Chemical Engineering, Federico II University of Naples, p.le V. Tecchio 80, 80125, Naples, Italy

    Luca Lanotte

Authors
  1. Giovanni Ausanio
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  2. Vincenzo Iannotti
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  3. Luca Lanotte
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  4. Luciano Lanotte
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Correspondence to Giovanni Ausanio.

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Ausanio, G., Iannotti, V., Lanotte, L. et al. Optimization of the coupling between piezoresistivity and magnetoelasticity in an elastomagnetic composite to sense a spatial gradient of the magnetic field. Eur. Phys. J. B 86, 51 (2013). https://doi.org/10.1140/epjb/e2012-30657-1

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  • DOI: https://doi.org/10.1140/epjb/e2012-30657-1

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