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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

  • Giovanni Ausanio
  • Vincenzo Iannotti
  • Luca Lanotte
  • Luciano Lanotte
Regular Article
Part of the following topical collections:
  1. Topical issue: New Trends in Magnetism and Magnetic Materials

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.

Keywords

Topical issue: New trends in magnetism and magnetic materials. Guest editors: Francesca Casoli, Massimo Solzi and Paola Tiberto 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Giovanni Ausanio
    • 1
  • Vincenzo Iannotti
    • 1
  • Luca Lanotte
    • 2
  • Luciano Lanotte
    • 1
  1. 1.CNR-SPIN, Department of Physical Sciences, Federico II University of NaplesNaplesItaly
  2. 2.Department of Chemical EngineeringFederico II University of NaplesNaplesItaly

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