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

doi:10.1117/12.2189085

11 September 2015 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, Spintronics VIII; 95512Y (2015) https://doi.org/10.1117/12.2189085
Event: SPIE Nanoscience + Engineering, 2015, San Diego, California, United States

Abstract

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.

Citation Download Citation

G. Melilli, B. Madon, M.-C. Clochard, and J.-E. Wegrowe "Orientation effect on the giant stress field induced in a single Ni nanowire by mechanical strain", Proc. SPIE 9551, Spintronics VIII, 95512Y (11 September 2015); https://doi.org/10.1117/12.2189085

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KEYWORDS

Nickel

Polymers

Magnetism

Ferroelectric polymers

Nanowires

Magnetostrictive materials

Resistance

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