Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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Prototype Milli Gauss Meter Using Giant Magnetoimpedance Effect in Self Biased Amorphous Ribbon

  • Kollu, Pratap (Department of Materials Science and Engineering, Chungnam National University) ;
  • Yoon, Seok-Soo (Department of Physics, Andong National University) ;
  • Kim, Gun-Woo (Department of Materials Science and Engineering, Chungnam National University) ;
  • Angani, C.S. (Department of Materials Science and Engineering, Chungnam National University) ;
  • Kim, Cheol-Gi (Department of Materials Science and Engineering, Chungnam National University)
  • Received : 2010.09.06
  • Accepted : 2010.09.29
  • Published : 2010.12.31
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Abstract

In our present work, we developed a GMI (giant magnetoimpedance) sensor system to detect magnetic fields in the milli gauss range based on the asymmetric magnetoimpedance (AGMI) effect in Co-based amorphous ribbon with self bias field produced by field-annealing in open air. The system comprises magnetoimpedance sensor probe, signal conditioning circuits, A/D converter, USB controller, notebook computer, and program for measurement and display. Sensor probe was constructed by wire-bonding the cobalt based amorphous ribbon with dimensions $10\;mm\;{\times}\;1\;mm\;{\times}\;20\;{\mu}m$ on a printed circuit board. Negative feedback was used to remove the hysteresis and temperature dependence and to increase the linearity of the system. Sensitivity of the milli gauss meter was 0.3 V/Oe and the magnetic field resolution and environmental noise level were less than 0.01 Oe and 2 mOe, respectively, in an unshielded room.

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References

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