Giant magnetoimpedance effect and voltage response in meander shape Co-based ribbon

Field-annealed Co-based amorphous ribbon (Metglas^® 2705M) with a meander structure is fabricated by MEMS technology and the giant magnetoimpedance (GMI) effects are studied at different magnetic fields and frequencies. The maximum longitudinal GMI ratio of the ribbon is 193.7% and the magnetic field sensitivity is 17.4%/Oe. The maximum GMI ratio of the meander ribbon is much larger than the single strip ribbon mainly due to the larger change ratio of inductance L. The sensitivity of an output U reach up to 10 V/A and U thermal fluctuation is less than 15 mV in the temperature range of ?20 to 40°C. This meander shape ribbon can be considered as a good candidate for the GMI-based sensor fabrication.