Magnetic field sensors using arrays of electrospun magnetoelectric Janus nanowires

Abstract

The fabrication and characterization of the first magnetoelectric sensors utilizing arrays of Janus magnetoelectric composite nanowires composed of barium titanate and cobalt ferrite are presented. By utilizing magnetoelectric nanowires suspended across electrodes above the substrate, substrate clamping is reduced when compared to layered thin-film architectures; this results in enhanced magnetoelectric coupling. Janus magnetoelectric nanowires are fabricated by sol–gel electrospinning, and their length is controlled through the electrospinning and calcination conditions. Using a directed nanomanufacturing approach, the nanowires are then assembled onto pre-patterned metal electrodes on a silicon substrate using dielectrophoresis. Using this process, functional magnetic field sensors are formed by connecting many nanowires in parallel. The observed magnetic field sensitivity from the parallel array of nanowires is 0.514 ± .027 mV Oe −1 at 1 kHz, which translates to a magnetoelectric coefficient of 514 ± 27 mV cm −1 Oe −1 .

Most recent developments in electrospun magnetic nanofibers: A review

“…0.51 mV/Oe could be reached at 1 kHz. 120 Large magneto-electric coefficients were also found in barium titanate-cobalt ferrite and lead zirconate titanate-nickel zinc ferrite Janus nanowires. 121 As an UV detection sensor as well as for photocatalysis, electrospun Fe 2 O 3 /TiO 2 nanofibers were used by Liu et al The metal nanoparticles shifted the absorption range of TiO 2 from the UV to the visible range, enabling photocatalysis under visible light.…”

Overcoming the rise in local deposit resistance during electrophoretic deposition via suspension replenishing

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