The magnetic aftereffect (MAE) δr/r, the perminvar critical field Hcr, the initial susceptibility x10, the coercive field Hc, and the magnetically induced anisotropy (MIA) Kuin in (Co1−xFex)75Si15B10 (0 ≦ x ≦ 1) metallic glasses are examined. The ribbons are subjected to different kinds of heat treatments: annealings in parallel and transverse magnetic field. The results are discussed in terms of the theory of two‐level systems.

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The coercive force of amorphous ferromagnetic ribbons depends on surface properties. In order to investigate this dependence the ribbons are thinned step by step from airside and/or wheel‐side and the coercive force is measured at each step. Supposing that the coercive force can be divided in volume and surface contributions these parts are determined from the measured curves: coercive force vs. inverse ribbon thickness. The investigations are made on Fe100–yBx and Fe85−yCryB15 metallic glass ribbons with different quality of surface layers.

The effect of boron content and the effect of anisotropy energy on the magnetic aftereffect (MAE) Δr/r, the initial susceptibility χ10, the perminvar critical field Hcr, the coercive force Hc in as‐quenched and annealed (below TC) Co100−xBx (17.3 ≦ x ≦ 30) amorphous alloys is investigated.