Design of a GMI magnetic sensor based on longitudinal excitation

Abstract In this article, we develop a micro magnetic sensor found on the Fe-based amorphous ribbon with longitudinal stimulation with the recognition that the micro magnetic sensor has the characteristics of good linearity, high sensitivity, high repeatability and low cost. The characteristics of Fe-based materials and the longitudinal driving mode are presented. The structure of the GMI sensing element, the principle of the conditioning circuit, the properties of the bias magnetic field, the effects of the excitation frequency of pulsed current and the length ratio of the ribbon versus the coil are also investigated. The GMI sensing element is made up of a 12-mm-long, 2-mm-wide and 20-μm-thick Fe-based amorphous ribbon, a bobbin and a 0.08-mm diameter enamel wire of 100 turns exhibiting giant magneto-impedance ratio. The bias magnetic field is provided by the permanent magnet NdFeB to shift the working points to the linear part of the impedance characteristics. The full measurement range of the magnetic field detection is ±2.5 Oe, and the sensitivity achieves 400 mV/Oe.

[1]  Hua-Xin Peng,et al.  Giant magnetoimpedance materials: Fundamentals and applications , 2008 .

[2]  H. Chiriac,et al.  Giant magneto-impedance effect in soft magnetic wire families , 2002 .

[3]  H. Chiriac,et al.  Comparative study of the giant magneto-impedance effect in Fe-based nanocrystalline ribbons , 1997 .

[4]  M. Vázquez,et al.  Influence of the sample length and profile of the magnetoimpedance effect in FeCrSiBCuNb ultrasoft magnetic wires , 2002 .

[5]  Zhenjie Zhao,et al.  Longitudinally driven magneto-impedance effect in annealed Fe-based nanocrystalline powder materials , 2002 .

[7]  Turgut Meydan,et al.  Application of amorphous materials to sensors , 1994 .

[8]  N. Manik,et al.  Dependence of the driving current on the harmonic behavior of giant magneto-impedance voltage of Co-based amorphous wires , 2006 .

[9]  P. Tiberto,et al.  Comparison between magneto-impedance properties of Fe73.5Cu3Nb1Si13.5B9 melt-spun and glass-covered wires , 2001 .

[10]  P. Ciureanu,et al.  Stress-induced asymmetric magneto-impedance in melt-extracted Co-rich amorphous wires , 2002 .

[11]  M. Knobel,et al.  Giant magnetoimpedance: concepts and recent progress , 2002 .

[12]  Pavel Ripka,et al.  Fluxgate: tuned vs. untuned output , 1998 .

[13]  V. Zhukova,et al.  Length effect in a negative magnetostrictive Co–Si–B amorphous wire with rectangular hysteresis loop , 2003 .

[14]  F. Sommer,et al.  Length and density changes of amorphous Pd40Cu30Ni10P20 Alloys due to structural relaxation , 2003 .

[15]  F. Jiancheng,et al.  Design of GMI micro-magnetic sensor and its application for geomagnetic navigation , 2008, 2008 2nd International Symposium on Systems and Control in Aerospace and Astronautics.

[16]  S. Qian,et al.  Longitudinally driven giant magnetoimpedance effect in stress-annealed Fe-based nanocrystalline ribbons , 2000 .

[17]  Kamruzzaman,et al.  The coercivity dependence of giant magneto-impedance effect in Fe–Cu–Nb–Si–B based metallic alloy ribbon at different crystalline stages , 2003 .

[18]  A. Zhukov,et al.  Enhancement of GMI effect in magnetic microwires through the relative temperature dependence of magnetization and anisotropy , 2009 .

[19]  Kaneo Mohri,et al.  Amorphous wire MI micro sensor using C-MOS IC multivibrator , 1997 .

[20]  R. Szewczyk,et al.  Stress dependence of sensitivity of fluxgate sensor , 2004 .

[21]  Tsuyoshi Uchiyama,et al.  Amorphous wire and CMOS IC-based sensitive micro-magnetic sensors (MI sensor and SI sensor) for intelligent measurements and controls , 2002 .

[22]  Tsuyoshi Uchiyama,et al.  Sensitive and quick response micro magnetic sensor utilizing magneto-impedance in Co-rich amorphous wires , 1995 .