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Enhancement of giant magneto-impedance in layered film by insulator separation

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7 Author(s)
Morikawa, T. ; Toyota Central Res. & Dev. Labs. Inc., Aichi, Japan ; Nishibe, Y. ; Yamadera, H. ; Nonomura, Y.
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Giant Magneto-Impedance (MI) effect of CoSiB/SiO2/Cu/SiO2/CoSiB films with line structures have been studied. Easy axes have been induced in perpendicular direction to the driving current, and the insulating SiO 2 layers have prevented the driving current from penetrating into the CoSiB layers. This structure has enabled the effective occurrence of resistance change at a frequency as low as several MHz. As a result, impedance change ratios ΔZ/Z0=(Zmaximum -Z(Hext=0))/Z(Hext=0) are much higher than that of any other layered film without insulating layers. The ΔZ/Z 0 at 20 MHz is as high as 700% at 11 Oe, and the maximum slope is 300%/Oe

Published in:

Magnetics, IEEE Transactions on  (Volume:32 ,  Issue: 5 )

Date of Publication:

Sep 1996

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