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Importance of matrix inelastic deformations in the initial response of magnetic elastomers

Abstract

Being able to predict and understand the behaviour of soft magnetic materials paves the way to their technological applications. In this study we analyse the magnetic response of soft magnetic elastomers (SMEs) with magnetically hard particles. We present experimental evidences of a difference between the first and next magnetisation loops exhibited by these SMEs, that depends non-monotonically on the interplay between the rigidity of the polymer matrix, its mechanical coupling with the particles, and the magnetic interactions in the system. In order to explain the microstructural mechanism behind this behaviour, we used a minimal computer simulation model whose results evidence the importance of irreversible matrix deformations due to both, translations and rotations of the particles. To confirm the simulation findings, computer tomography (CT) was used. We conclude that initial exposure to the field triggers the inelastic matrix relaxation in the SME, as particles attempt to reorient. However, once the necessary degree of freedom is achieved, both the rotations and the magnetisation behaviour become stationary. We expect this scenario not to be limited to the materials studied here, but also to apply to a broader class of hybrid SMEs.

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Publication details

The article was received on 01 Dec 2017, accepted on 09 Feb 2018 and first published on 12 Feb 2018


Article type: Paper
DOI: 10.1039/C7SM02366A
Citation: Soft Matter, 2018, Accepted Manuscript
  • Open access: Creative Commons BY-NC license
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    Importance of matrix inelastic deformations in the initial response of magnetic elastomers

    P. A. Sánchez, T. Gundermann, A. Dobroserdova, S. S. Kantorovich and S. Odenbach, Soft Matter, 2018, Accepted Manuscript , DOI: 10.1039/C7SM02366A

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