Fig. 3: Spin-dependent hopping-mediated grain boundary magnetoresistance.
From: Eco-sustainable magnetoresistive sensors towards disposable magnetoelectronics
a I-V characteristics of printed Fe/Fe3O4-NaCMC sensors with Fe particles thermally oxidized at 235 °C under medium vacuum. b Variation in resistance with temperature of printed Fe/Fe3O4-NaCMC sensors with Fe particles thermally oxidized at 235 °C under medium vacuum. c Logarithm of the electrical resistivity as a function of T −1/2 of the curve in (b). d Voltage-dependent magnetoresistance of printed Fe/Fe3O4-NaCMC sensors by Fe particles thermally oxidized at 235 °C under medium vacuum. e MR performance and electrical resistivity of printed Fe/Fe3O4-NaCMC sensors fabricated with the Fe particles thermally oxidized at different temperatures under medium vacuum. Error bars are presented as mean ± SD. f HR-TEM images of printed MR sensors fabricated with Fe particles thermally oxidized at different temperatures under medium vacuum. g XRD characteristics of Fe particles thermally oxidized at different temperatures under medium vacuum. Diffraction angle from 20° to 40° where the characteristic reflections of iron oxide occur. The full diffractograms are shown in Supplementary Fig. 13.
