Influence of varying metal-to-glass ratio on GMI effect in Co70.3Fe3.7B10Si13Cr3 amorphous glass-coated microwires

The influence of a varying metal-to-glass ratio on the GMI effect in amorphous glass-coated Co70.3Fe3.7B10Si13Cr3 microwires has been investigated. In the range of frequencies investigated (1–10 MHz), the magnitude of the GMI effect increases as the metal-to-glass ratio (h)(h) increases from 4.11 to 9.29. The GMI curves for the h=4.11h=4.11 microwire exhibit a single-peak feature for f≤1f≤1 MHz and a double-peak feature for f>1f>1 MHz, whereas a consistent double-peak feature is observed for microwires with h=8.07,8.72h=8.07,8.72, and 9.29. The largest GMI effect is achieved for microwires with h=9.29h=9.29. The anisotropy field (Hk), determined from GMI curves, increases with h=4.11h=4.11 to h=8.07h=8.07 and decreases when h>8.07h>8.07. The calculated radial stress decreases as hh increases from 4.11 to 9.29. These results provide further insights into the correlation between the GMI effect and microwire dimensions towards the GMI optimization of amorphous glass-coated magnetic microwires for sensor applications.