Abstract
The disturbing effect of the stray magnetic fields of Fe-based amorphous ribbons on the giant magnetoimpedance (GMI) sensor has been investigated systematically in this paper. Two simple methods were used for examining the disturbing effect of the stray magnetic fields of ribbons on the GMI sensor. In order to study the influence of the stray magnetic fields on the GMI effect, the square-shaped amorphous ribbons were tested in front, at the back, on the left and on the top of a meander-line GMI sensor made up of soft ferromagnetic films, respectively. Experimental results show that the presence of ribbons in front or at the back of GMI sensor shifts the GMI curve to a lower external magnetic field. On the contrary, the presence of ribbons on the left or on the top of the GMI sensor shifts the GMI curve to a higher external magnetic field, which is related to the coupling effect of the external magnetic field and the stray magnetic fields. The influence of the area and angle of ribbons on GMI was also studied in this work. The GMI sensor exhibits high linearity for detection of the stray magnetic fields, which has made it feasible to construct a sensitive magnetometer for detecting the typical stray magnetic fields of general soft ferromagnetic materials.
Highlights
The giant magnetoimpedance (GMI) effect is the large variation of impedance in soft magnetic materials when subjected to an external magnetic field [1,2,3,4]
The small changes of GMI ratio occur at higher external magnetic fields (>35 Oe), which is related to the stray magnetic fields becoming strongly overwhelmed by the overlarge external magnetic field
The disturbing effect of the stray magnetic fields in Fe-based amorphous ribbons has been examined by a meander-line GMI sensor
Summary
The giant magnetoimpedance (GMI) effect is the large variation of impedance in soft magnetic materials when subjected to an external magnetic field [1,2,3,4]. GMI sensors based on multilayered films are highly sensitive to the external magnetic field [1,2,3,4,5,6,7,8,9], making it ideal for use in detecting the stray magnetic fields. It is a well-known fact that the soft ferromagnetic amorphous ribbons have been widely applied in the field of magnetic cores, transformers, motors, choke coils and magnetic sensors because of their excellent soft magnetic properties. Magnetometer with a high linearity for detection of the stray magnetic fields
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