A design of highly sensitive GMI sensor

S. Yabukami, H. Mawatari, N. Horikoshi, Y. Murayama, T. Ozawa, K. Ishiyama, K. I. Arai

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

Abstract

Employing amplitude-modulation technique, we have optimized the giant magnetoimpedance (GMI) sensor. Our approach was to optimize the sensor structure so as to obtain a high signal-to-noise ratio by using finite element analysis. The optimum size of sensor strip is as follows: a thickness of 4.3 μm, a strip width of 20-30 μm, a length of several mm. The meander sensor element [CoNbZr (thickness, 4.3 μm; length, 5 mm; width, 30 μm; number of turns, 3) was fabricated using the lift-off process. A high impedance change over 200% was obtained at several hundred MHz. When a small AC magnetic field was applied to the sensor element, a very small AM signal was detected by the sensor system in a magnetically shielded room. A resolution of 1.7×10-8 Oe/Hz1/2 was obtained at 501 kHz.

Original languageEnglish
Pages (from-to)1318-1321
Number of pages4
JournalJournal of Magnetism and Magnetic Materials
Volume290-291 PART 2
DOIs
Publication statusPublished - 2005 Apr

Keywords

  • Finite element method
  • Magnetic field
  • Sensors
  • Skin effect

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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