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Anisotropic magnetoresistivity in structured elastomer composites: modelling and experiments.

José Luis Mietta1, Pablo I Tamborenea, R Martin Negri

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A new model explains anisotropic magnetoresistivity in structured elastomer composites (SECs). It links conductivity changes to magnetic pressure on conductive-magnetic filler chains, crucial for advanced sensor development.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Polymer Science

Background:

  • Structured elastomer composites (SECs) exhibit anisotropic magnetoresistivity due to aligned conductive-magnetic filler pseudo-chains.
  • The alignment is achieved by applying a magnetic field during composite fabrication.

Purpose of the Study:

  • To propose a constitutive model for anisotropic magnetoresistivity in SECs.
  • To elucidate the magneto-elastic coupling mechanism influencing conductivity.

Main Methods:

  • Development of a constitutive model incorporating magnetic pressure (Pmag) effects on filler pseudo-chains.
  • Calculation of conductivity changes based on electron tunneling probability and Pmag.
  • Experimental validation using polydimethylsiloxane (PDMS) with magnetite-silver (Fe3O4[Ag]) fillers.

Main Results:

  • The model accurately predicts magnetoresistance by correlating conductivity increase with magnetization-induced magneto-elastic coupling.
  • Simulations demonstrate the impact of matrix Young's modulus and filler saturation magnetization on SEC response.
  • The model is applicable to both superparamagnetic and blocked magnetic states.

Conclusions:

  • The proposed constitutive model provides a framework for understanding and predicting anisotropic magnetoresistivity in SECs.
  • This work facilitates the design of novel conductive elastomer composites for magnetic field sensing applications.