Magnetic hysteresis loops for several amorphous alloys after various heat treatments below the curie point

The hysteresis loops of amorphous Fe₈₀B₂₀, Fe₄₀Ni₄₀B₂₀, and Co₅₈Ni₁₀Fe₅Si₁₁B₁₆ alloys are investigated before and after various heat treatments in zero, dc, and ac magnetic fields and under different stress conditions. After definite treatments wasp-waisted or shifted hysteresis loops appear. A qualitative analysis of the results shows that the domain structure originally determined by stresses is stabilized by the formation of induced anisotropies during the heat treatment.