Abstract
Magnetic sensors are mandatory in a broad range of applications nowadays, being the increasing interest on such sensors mainly driven by the growing demand of materials required by Industry 4.0 and the Internet of Things concept. Optimized power consumption, reliability, flexibility, versatility, lightweight and low-temperature fabrication are some of the technological requirements in which the scientific community is focusing efforts. Aiming to positively respond to those challenges, this work reports magnetic proximity sensors based on magnetoelectric (ME) polyvinylidene fluoride (PVDF)/Metglas composites and an excitation-printed coil. The proposed magnetic proximity sensor shows a maximum resonant ME coefficient (α) of 50.2 Vcm−1 Oe−1, an AC linear response (R2 = 0.997) and a maximum voltage output of 362 mV, which suggests suitability for proximity-sensing applications in the areas of aerospace, automotive, positioning, machine safety, recreation and advertising panels, among others.
Highlights
The coils to be printed were first evaluated by a Finite Element Method Magnetics by an axisymmetric problem analysis, allowing to study the effect of geometry in the value of the generated
The printed coils were produced by screen printing, using a semi-automatic screen printer, DX-305D from Shenzhen Dstar (Shenzhen, China), with adjustable speed and with a polyester mesh of 100 wires per centimeter
The magnetic coil printing process was performed considering the results obtained through theoretical simulations (Figure 2a)
Summary
Since the beginning of the new millennium, strong efforts have been dedicated toward developing novel smart and multifunctional materials, and to integrate them into technological applications [1,3] Such efforts represent a multidisciplinary research field with contributions and implications in the areas of sensors and actuators, energy, mobility, interactivity and biomedical sciences, among others [4]. This interesting research scenario actively promotes the production, optimization and application of innovative materials with tailored or improved functionalities [4]. Magnetoactive materials have been used for more than two thousand years (202 BC–220 AD), initially for magnetic compasses [9] and Materials 2020, 13, 1729; doi:10.3390/ma13071729 www.mdpi.com/journal/materials
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