Abstract
Field-annealed Co-based amorphous ribbon (Metglas® 2705M) with a tortuous structure is fabricated by MEMS technology and the giant magneto impedance (GMI) effects are studied at various magnetic field and frequency. The magnetization curve of the ribbon shows small coercivity and anisotropy field. The maximum longitudinal GMI ratio of the ribbon is 193.7% and the magnetic field sensitivity is 17.4%/Oe. The GMI peak value of the tortuous ribbon is much larger than the single strip ribbon due to the larger external inductance result from the tortuous shape. Tortuous structure and line width both have strong influence on GMI effect. This tortuous shape ribbon can be considered as a good candidate to fabricate the GMI-based sensor with excellent performance.
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