Effect of annealing field orientation on GMI profiles in Co-based amorphous ribbon

The giant magnetoimpedance (GMI) is studied as function of annealing-field angle /spl theta//sub k/ in Co/sub 66/Fe/sub 4/NiB/sub 14/Si/sub 15/ ribbon with respect to transverse direction. The GMI profile at 10 kHz shows two peaks located at negative and positive external field H. The interval between two peaks, about 2.1 Oe for /spl theta//sub k/=0/spl deg/, slightly increases with /spl theta//sub k/ up to /spl theta//sub k/=30/spl deg/ and then decreases down to 1.0 Oe for /spl theta//sub k/=90/spl deg/. However, two peaks are asymmetric and hysteresis exists during cyclic magnetization. The asymmetry ratio, fractional difference of two peaks, is maximum about 2% for /spl theta//sub k/=10/spl deg/ and its sign is reversed from /spl theta//sub k/=40.