Coil-less fluxgate effect in amorphous wires

✍ Scribed by S. Atalay; N. Bayri; T. Izgi; F.E. Atalay; V.S. Kolat

• Book ID: 104092692
• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 770 KB
• Volume: 158
• Category: Article
• ISSN: 0924-4247
• DOI: 10.1016/j.sna.2009.12.028

✦ Synopsis

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In this study, the coil-less fluxgate properties of as-received amorphous microwires with the compositions (Co 0.94 Fe 0.06 ) 72.5 Si 12.5 B 15 , Fe 77.5 Si 7.5 B 15 and Co 72.5 Si 12.5 B 15 have been investigated. As its name implies, a coil-less fluxgate is a new type of magnetic field sensor without a coil. When the (Co 0.94 Fe 0.06 ) 72.5 Si 12.5 B 15 wire is magnetically saturated in the circumferential direction with a 30 kHz and 48 mA driving current and under the effect of 33 rad/m torsional strain, there is a linear variation in the second harmonic of the voltage from wire ends, U wire , as a function of the applied external dc magnetic field, H z , along the wire length. The slope of the second harmonic versus H z curve changes in opposite directions as the direction of torsional strain changes from the positive to the negative direction. Coil-less fluxgate effects in as-received Fe 77.5 Si 7.5 B 15 and Co 72.5 Si 12.5 B 15 wires have also been investigated. A very small change in the second harmonic of voltage U wire is observed in Fe 77.5 Si 7.5 B 15 wire, with some small hysteresis.