Title :
Enhancement of giant magneto-impedance in layered film by insulator separation
Author :
Morikawa, Takeshi ; Nishibe, Yuji ; Yamadera, Hideya ; Nonomura, Yutaka ; Takeuchi, Masaharu ; Sakata, Jiro ; Taga, Yasunori
Author_Institution :
Toyota Central Res. & Dev. Labs. Inc., Aichi, Japan
fDate :
9/1/1996 12:00:00 AM
Abstract :
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
Keywords :
boron alloys; cobalt alloys; copper; giant magnetoresistance; magnetic multilayers; silicon alloys; silicon compounds; 20 MHz; CoSiB-SiO2-Cu-SiO2-CoSiB; driving current; easy axis; giant magnetoimpedance; insulator separation; layered film; line structure; Amorphous magnetic materials; Amorphous materials; Frequency; Impedance; Insulation; Magnetic films; Magnetic sensors; Magnetic separation; Shape measurement; Soft magnetic materials;
Journal_Title :
Magnetics, IEEE Transactions on
