Jump to main content
Jump to site search

Issue 30, 2016
Previous Article Next Article

Anisotropic magnetoresistivity in structured elastomer composites: modelling and experiments

Author affiliations

Abstract

A constitutive model for the anisotropic magnetoresistivity in structured elastomer composites (SECs) is proposed. The SECs considered here are oriented pseudo-chains of conductive-magnetic inorganic materials inside an elastomer organic matrix. The pseudo-chains are formed by fillers which are simultaneously conductive and magnetic dispersed in the polymer before curing or solvent evaporation. The SEC is then prepared in the presence of a uniform magnetic field, referred to as Hcuring. This procedure generates the pseudo-chains, which are preferentially aligned in the direction of Hcuring. Electrical conduction is present in that direction only. The constitutive model for the magnetoresistance considers the magnetic pressure, Pmag, induced on the pseudo-chains by an external magnetic field, H, applied in the direction of the pseudo-chains. The relative changes in conductivity as a function of H are calculated by evaluating the relative increase of the electron tunnelling probability with Pmag, a magneto-elastic coupling which produces an increase of conductivity with magnetization. The model is used to adjust experimental results of magnetoresistance in a specific SEC where the polymer is polydimethylsiloxane, PDMS, and fillers are microparticles of magnetite–silver (referred to as Fe3O4[Ag]). Simulations of the expected response for other materials in both superparamagnetic and blocked magnetic states are presented, showing the influence of the Young's modulus of the matrix and filler's saturation magnetization.

Graphical abstract: Anisotropic magnetoresistivity in structured elastomer composites: modelling and experiments

  • This article is part of the themed collection: Polymers
Back to tab navigation

Publication details

The article was received on 21 maí 2016, accepted on 03 júl. 2016 and first published on 04 júl. 2016


Article type: Paper
DOI: 10.1039/C6SM01173J
Citation: Soft Matter, 2016,12, 6430-6441
  •   Request permissions

    Anisotropic magnetoresistivity in structured elastomer composites: modelling and experiments

    J. L. Mietta, P. I. Tamborenea and R. Martin Negri, Soft Matter, 2016, 12, 6430
    DOI: 10.1039/C6SM01173J

Search articles by author

Spotlight

Advertisements