Giant magnetoimpedance of electrodeposited Co/Cu/Co on Ag wires

Sirisathitkul, Chitnarong; Jantaratana, Pongsakorn

doi:10.1088/0022-3727/40/15/007

Cited by 8 publications

(2 citation statements)

References 18 publications

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“…In order to get a larger GMI effect, it is necessary to reduce skin depth by choosing magnetic materials that have large permeability and small skin depth δ m and electrical resistance R dc [2]. Much effort has been made to investigate the influence of sample geometry on the GMI effect in different materials, including amorphous wires [3][4][5], layered and multilayered films [6][7][8], amorphous ribbon [9,10] and layered composite wires [11][12][13], with the aim of excellent GMI performance and industrial application. These results suggest that such geometrical effect should be considered carefully whenever GMI results are analysed and reported.…”

Section: Introductionmentioning

confidence: 99%

Effect of meander structure and line width on GMI effect in micro-patterned Co-based ribbon

Chen¹,

Zhou²,

Lei³

et al. 2009

J. Phys. D: Appl. Phys.

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The giant magnetoimpedance (GMI) effect is observed in micro-patterned Co-based commercial amorphous ribbon. The effect of structure (meander, single strip) and line width (200, 400, 600 and 800 µm) on the GMI effect is investigated. The GMI reaches its maximum value of 193.7% in the three-turns meander ribbon with 600 µm line width at a frequency of 20 MHz and a field of 10 Oe. The corresponding GMI sensitivity is 19.4% Oe−1. Meander structure and line width both have a strong influence on the GMI effect. An explanation based on the changes in inductance, resistance and the complex magnetic interaction are presented.

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Section: Introductionmentioning

confidence: 99%

Effect of meander structure and line width on GMI effect in micro-patterned Co-based ribbon

Chen¹,

Zhou²,

Lei³

et al. 2009

J. Phys. D: Appl. Phys.

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“…The reduction of transverse permeability by an application of a dc magnetic field increases this skin depth and decreases the impedance. In the past few years, GMI materials in the forms of wires [ 3 - 4 ] and ribbons [ 5 - 6 ] were studied and implemented in various sensing systems [ 7 - 11 ]. According to our previous work in silicon steel strips cut from recycled transformer cores [ 12 ], the GMI ratio and the characteristic frequency (the frequency with a maximum GMI ratio) were dependent on the width of the strips.…”

Section: Introductionmentioning

confidence: 99%

Low-cost Sensors Based on the GMI Effect in Recycled Transformer Cores

Jantaratana

Sirisathitkul

2008

Sensors

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Sensors based on the giant magnetoimpedance (GMI) effect in silicon steels were constructed. Strips of silicon steels (0.500 mm-thick, 35.0 mm-long) with widths ranging from 0.122 to 1.064 mm were cut from recycled transformer cores. Since a maximum GMI ratio of 300% and a maximum field sensitivity of 1.5%/Oe were observed in a 1.064 mm-wide sample at 200 kHz, the 1.064 mm-wide strips were chosen as sensing elements in a slot key switch, angular velocity sensor, current sensor and force sensor. The sensing elements were integrated into electronic circuits and the changes in impedance were monitored. Variations in voltage due to these changes were typically small and must therefore be amplified by the electronic circuits. For the current sensor and force sensor, the variation in the voltage drop across the GMI sensing element had non-linear variations with either current or force and a conversion formula from a computer program was therefore needed. The performance of the systems was tested. These sensing systems were stable, highly sensitive, hysteresis-free and could be produced on a mass scale. Based on their GMI effect, the silicon steels are versatile alternative low-cost sensors.

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