Magnetoimpedance studies on as-quenched Fe66-xCoxNi7Si7B20 (x=0, 33 and 66) ribbons

Magnetoimpedance (MI) has been investigated in the as quenched Fe66-xCoxNi7Si7B20 (x=0, 33 and 66) ribbons. In plane anisotropy was present in as-quenched x=0, 33 and 66 ribbons. The largest MI values for x=0, 33 and 66 ribbons are 25% (at 7 MHz), 26% (at 8 MHz) and 45% (at 8 MHz) respectively. Largest MI values increased with increasing Co due to reduced magnetic anisotropy. Maximum MI values reduced at higher frequencies due to increased anisotropy fields.