Mr. Giuseppe Melilli Profile

Giuseppe Melilli

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Proceedings Article | 11 September 2015 Paper

Orientation effect on the giant stress field induced in a single Ni nanowire by mechanical strain

G. Melilli, B. Madon, M.-C. Clochard, J.-E. Wegrowe

Proceedings Volume 9551, 95512Y (2015) https://doi.org/10.1117/12.2189085

KEYWORDS: Nickel, Polymers, Magnetism, Ferroelectric polymers, Magnetostrictive materials, Resistance, Polymer thin films, Ions, Nanowires, Ferromagnetics

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The change of magnetization (i.e. using the inverse magnetostriction effect) allows to investigate at the nanoscale the effects of thermoelastic and piezoelectric strain of an active track-etched β-PVDF polymer matrix on an electrodeposited single-contacted Ni nanowire (NW). The magnetization state is measured locally by anisotropic magnetoresitance (AMR). The ferromagnetic NW plays thus the role of a mechanical probe that allows the effects of mechanical strain to be characterized and described qualitatively and quantitatively. Due to the inverse magnetostriction, a quasi-disappearance of the AMR signal for a variation of the order of ΔT ≈ 10 K has been evidenced. The coplanarity of the vectors between the magnetization and the magnetic field is broken. A way of studying the effect of the geometry on such a system, is to fabricate oriented polymer templates. Track-etched polymer membranes were thus irradiated at various angles (α_irrad) leading, after electrodeposition, to embedded Ni NWs of different orientations. With cylindrical Ni NW oriented normally to the template surface, the induced stress field in a single Ni NW was found 1000 time higher than the bulk stress field (due to thermal expansion measured on the PVDF). This amplification results in three nanoscopic effects: (1) a stress mismatch between the Ni NW and the membrane, (2) a non-negligible role of the surface tension on Ni NW Young modulus, and (3) the possibility of non-linear stress-strain law. When the Ni NWs are tilted from the polymer template surface normality, the induced stress field is reduced and the amplification phenomenon is less important.

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