Strain Dependence of Hysteretic Giant Magnetoimpedance Effect in Co-Based Amorphous Ribbon

Abstract

The significant strain dependence of the hysteretic Giant Magnetoimpedance (GMI) effect in a Co67Fe3Cr3B12Si15 amorphous alloy in a low magnetizing field is presented. A simplistic test stand capable of continuous measurements of GMI characteristics under the influence of strain is detailed. Based on the results, a stress-impedance (SI) sensor is proposed, with a gauge factor similar to semiconductor strain gauges but more robust. An effective method of minimizing external magnetic field influence on the SI effect is given.

Ultrasensitive Magnetic Field Sensors for Biomedical Applications

“…Giant MI has rapidly become a very popular research topic, and there is a significant growth of works devoted to the enhancement of sensitivity [103], improving temperature stability [104], shifting the operational frequency to the GHz range (e.g., [105,106]) and exploiting stress [107] and temperature [108]. A schematic image of the sensing element of a GMI magnetometer based on microwire is shown in Figure 7.…”

Novel Giant Magnetoimpedance Magnetic Field Sensor

“…Research on the GMI phenomenon in the samples produced from ribbons made of amorphous alloys was carried out with the use of the specially developed impedance Z measurement station as a function of an external magnetizing field, H. The block diagram of the developed station is shown in Figure 1, and the photo of the station is shown in Figure 2. Careful sample mounting ensured the small influence of stress on the results; this is particularly important due to the GMI-related [38] the stress-impedance effect (i.e., a change in the sample impedance under the influence of stress-induced change in magnetic permeability) [39]. This is one of the adverse instances of the significant magnetoelastic effect in amorphous alloys [40,41], which changes the whole magnetization process due to induced anisotropy [42,43], but could be otherwise utilized [44,45].…”

An Hourglass-Shaped Wireless and Passive Magnetoelastic Sensor with an Improved Frequency Sensitivity for Remote Strain Measurements

“…From the figure, it can be seen that the resonant frequency did not change very much. The highest frequency shift was calculated by ∆ f 2 = f h − f l = 98 − 97.45 = 0.55 kHz (4) where f h is largest resonant frequency in the level zone, and f l is the smallest resonant frequency in the level zone. Therefore, the frequency shift was very small in the level zone.…”

“…These sensors are based on different effects of the magnetoelastic material. These effects include the giant magnetoimpedance (GMI) effect [1,2], stressimpedance (SI) effect [3,4], the small magnetization rotaion (SAMR) technique [5], and the resonant magnetoelastic effect. A new tensductor sensor [6] was developed based on the magnetoelastic material in 2018.…”