Abstract
In this paper, micro-patterned cobalt-based amorphous ribbons with different structures are fabricated by MEMS technology, including bonding, lithography and electroplating. The commercial amorphous ribbons (VITROVAC 6025Z) are purchased from VACUUMSHMELZE ® company. The structures of micro-patterned ribbons are designed for meander shape for different turns (one turn, two turns and three turns). The effect of external magnetic field orientation and turns on GMI ratios were studied in the frequency range of 1–40 MHz. It is found that GMI ratios almost all present negative value, which is related to the material property, namely a large coercive force. Compared with the GMI ratios obtained at transverse external magnetic field, the maximum negative GMI ratio obtained at longitudinal external magnetic field is higher. The value of −69.93% is obtained at a current frequency of 20 MHz and the magnetic field of 150 Oe. With the increase of the number of turns, the maximum positive GMI ratio increases from 0.5 % for the one turn sample to the 2.8% for the sample with three turns. The maximum nagative GMI ratio is obtained by three-turns sample. The GMI character of VITROVAC 6025Z micro-patterned ribbon is significant and the microsensor is expected to be used in biological sensing field.
Highlights
Giant magnetoimpedance (GMI) effect is defined as a large change in the ac complex impedance of a soft ferromagnetic conductor upon the application of a dc magnetic field
The results show that the GMI ratios obtained at longitudinal external magnetic field is higher than that obtained at transverse external magnetic field
The results show that the ribbons with tortuous shape of three turns acquire the maximum positive GMI and the maximum negative GMI ratios at a relatively small magnetic field and a higher frequency
Summary
Giant magnetoimpedance (GMI) effect is defined as a large change in the ac complex impedance of a soft ferromagnetic conductor upon the application of a dc magnetic field. It has drawn an intensively research activity by reason of promising technological applications based on the GMI phenomenon since its discovery [1, 2]. Exhibit a high GMI level, a high sensitivity to an applied magnetic field [8], which makes them promising GMI materials In this context, we employ micro electro-mechanical system (MEMS) technology to fabricate micro-patterned cobalt-based amorphous ribbons (VITROVAC 6025Z) with tortuous shape for different turns. With the increase of the number of turns, the maximum of the GMI ratio increases from 31.2 % for the one turn sample to the 69.93% for the sample with three turns
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