Abstract
Amorphous soft magnetic microwires have attracted much attention in the area of sensor applications due to their excellent properties. In this work, we study the influence of annealing treatments (stress and conventional) in the giant magnetoimpedance (GMI) response and the field sensitivity of the soft magnetic Co69.2Fe3.6Ni1B12.5Si11Mo1.5C1.2 glass-coated microwires. Here we report a remarkable and simultaneous enhancement of GMI effect and field sensitivity. The highest sensitivity of 104%/Oe and the GMI response of 234% were achieved for 300 °C stress-annealed samples at 472 and 236 MPa, respectively. Additionally, we found that stress-annealed microwires exhibit a frequency dependence on maximal GMI response and field sensitivity. These findings are obtained by fine-tuning their magnetoeslastic anisotropies through stress-annealing treatments of as-prepared microwires at the proper temperature and axial applied stress upon annealing. We hope that the results presented here widen the scope of investigations for the future design of soft magnetic materials for sensor purposes.
Highlights
IntroductionMagnetic sensors have captivated scientific attention for their technological findings in a broad scope of fields
Over the last decades, magnetic sensors have captivated scientific attention for their technological findings in a broad scope of fields
We have performed a comprehensive investigation of the giant magnetoimpedance (GMI) response and the field sensitivity by modifying the magnetoelastic anisotropies through different thermal treatments on the ferromagnetic amorphous Co69.2 Fe3.6 Ni1 B12.5 Si11 Mo1.5 C1.2 glass-coated microwire
Summary
Magnetic sensors have captivated scientific attention for their technological findings in a broad scope of fields. These applications range from space research, military applications, security systems, high-density magnetic recording and biomedicine [1,2,3,4,5,6]. In this line, the miniaturization of sensors and technological devices opens new routes in the property-to-function conversion. It should be highlighted that their excellent magnetic softness, exhibiting nearly zero magnetostriction constant value and a Sensors 2020, 20, 3227; doi:10.3390/s20113227 www.mdpi.com/journal/sensors
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