Magnetostriction in a Co-30% Fe alloy

摘要

We have studied the magnetostriction and magnetic properties of a deformed and annealed Co-30% Fe alloy. The cold-rolled and annealed (at 820 C for 40 min) sample exhibits a substantial magnetostriction of /spl sim/110/spl times/10/sup -6/ at a practical, low field of /spl sim/100 Oe, while only /spl sim/10/spl times/10/sup -6/ for the same applied field is obtained for the as-cold-rolled sample. The saturation magnetostriction of the annealed Co-30%Fe alloy was /spl sim/140/spl times/10/sup -6/, which is significantly affected by the cold-rolling and annealing processes. This drastic dependence of the magnetostriction behavior on the alloy processing is believed to be a result of the microstructure and residual stress changes brought about by the heat treatment processing.