A sensitive magnetic field sensor utilizing the giant magneto-impedance effect in field-annealed co-based amorphous ribbons

Jiang Y., Fang J., Wang S., Song Y.
Laboratory of Function Materials and Device, Key Lab. of Fundamental Sci. for Natl. Def. of Novel Inertial Instrum. and Navig. System Technology, Beihang University, Beijing 100191, China; Institute of Materials Science and Engineering, Beihang University, Beijing 100191, China

Abstract: A large giant magneto-impedance (GMI) effect was observed in Co 69Fe4Si12.B15 amorphous ribbon after it was annealed at a temperature of 450 °C for 30 min in a 10 Oe annealing field along the transverse direction of the ribbon. A maximum GMI ratio of 320% and a sensitivity of about 200%/Oe were obtained under an excitation AC current at a frequency of 10 MHz, which is helpful in the fabrication of high sensitivity magnetic sensors. Based on these excellent GMI properties, a sensitive magnetic field sensor was developed utilizing the abovementioned field-annealed amorphous ribbon as the sensing element. The performance of the sensor was tested in open-loop and closed-loop conditions. Compared with the open-loop testing, the sensor shows a better linearity of 0.59% and a larger measuring range (-2.5∼2.5 Oe) in the closed-loop testing. The closed-loop testing also shows a sensitivity of 0.34 V/Oe compared with the sensitivity of 2.3 V/Oe in the open-loop testing. The designed sensor can be applied to detect the value and direction of geomagnetic fields, which have practical applications in geomagnetic navigation. Copyright copy; 2010 American Scientific Publishers. All rights reserved.
Author Keywords: Closed-loop; Co-Based amorphous ribbons; Field-annealing; Giant magneto-impedance (GMI); Magnetic sensor; Open-loop

Year: 2010
Source title: Sensor Letters
Volume: 8
Issue: 2
Page : 314-319
Link: Scorpus Link
Document Type: Article
Source: Scopus
 Authors with affiliations:
  1. Jiang, Y., Laboratory of Function Materials and Device, Key Lab. of Fundamental Sci. for Natl. Def. of Novel Inertial Instrum. and Navig. System Technology, Beihang University, Beijing 100191, China
  2. Fang, J., Laboratory of Function Materials and Device, Key Lab. of Fundamental Sci. for Natl. Def. of Novel Inertial Instrum. and Navig. System Technology, Beihang University, Beijing 100191, China
  3. Wang, S., Laboratory of Function Materials and Device, Key Lab. of Fundamental Sci. for Natl. Def. of Novel Inertial Instrum. and Navig. System Technology, Beihang University, Beijing 100191, China
  4. Song, Y., Institute of Materials Science and Engineering, Beihang University, Beijing 100191, China
Download Abstract: geo31.pdf