Enhancement of Giant Magneto-Impedance in Series Co-Rich Microwires for Low-Field Sensing Applications
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Two soft ferromagnetic Co68.25Fe4.25Si12.25B15.25 microwires with the same diameter of 50 ± 1 μm but different fabrication processes were placed in series and in parallel circuit configurations to investigate their giant magneto-impedance (GMI) responses in a frequency range of 1–100 MHz for low-field sensing applications. We show that, while the low-field GMI response is significantly reduced in the parallel configuration, it is greatly enhanced in the series connection. These results suggest that a highly sensitive GMI sensor can be designed by arranging multi-wires in a saw-shaped fashion to optimize the sensing area, and soldered together in series connection to maintain the excellent magnetic field sensitivity.
KeywordsMagnetic microwire magneto-impedance circuit design magnetic sensors
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This work was financially supported by the National Natural Science Foundation of China (NSFC) under Grant Nos. 51371067 and 51671071. S.D.J. acknowledges support from the China Scholarship Council (CSC) fellowship. Research at USF was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Award No. DE-FG02-07ER46438 (GMI study).
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