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Magneto-piezoresistance in elastomagnetic composites
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View: Figures


Image of FIG. 1.
FIG. 1.

SEM image (5 × 5 μm2) of an elastomagnetic composite with 32 vol% Ni MPs.

Image of FIG. 2.
FIG. 2.

(a) Longitudinal stress (σx ) and (b) transverse strain (ɛy ) vs longitudinal strain (ɛx ) characteristic behaviors for 37 vol% Ni MPs. The reported data represent the average values obtained from reiterated experimental cycles; the error bars are too small to be visible.

Image of FIG. 3.
FIG. 3.

Scheme of the experimental set-up for on-line resistance measurements as a function of a controlled longitudinal deformation of the bar shaped elastomagnetic composites.

Image of FIG. 4.
FIG. 4.

Average value of ln R vs longitudinal strain (ɛx ) in samples with 37 vol% Ni MPs (○) and 43 vol% Ni MPs (□). The error bars are too small to be visible. The solid lines represent the best fit of Eq. (5) to the experimental data.

Image of FIG. 5.
FIG. 5.

(a) Experimental set-up for magneto-piezoresistance measurements in elastomagnetic composites: S - sample; C - sample clamping mechanism; P - thin conductive wire providing electric contact with the resistance meter; M - fixed permanent magnet, parallel and coaxial to a second movable magnet not shown in the image. (b) Configuration of the longitudinal component of the magnetic induction field (Bz ) in the sample region for different distances between the magnets: (1) 120 mm (∂Bz /∂z =− 3 T/m), (2) 78 mm (∂Bz /∂z =− 2 T/m), (3) 68 mm (∂Bz /∂z =− 1.5 T/m), (4) 60 mm (∂Bz /∂z =− 1 T/m).

Image of FIG. 6.
FIG. 6.

Magneto-piezoresistance ratio (MPR = [R 0R(∂Bz /∂z)]/R 0) as a function of the magnetic induction field gradient (∂Bz /∂z) in samples with: 37 vol% Ni MPs (a) and 43 vol% Ni MPs (b). MPR average values and correspondent errors of reiterated measurements are reported.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Magneto-piezoresistance in elastomagnetic composites