Abstract
A study of the magnetic anisotropy induced by cold rolling was made for h.c.p. Co and Co–Ni single crystals containing 10 and 20 at %Ni by using a torque magnetometer. The observed induced uniaxial anisotropy Kur for Co was found to be maximum, −5×105 erg/cm3, at about R=5%, where the direction of the easy axis was parallel to the rolling direction. For the 10%Ni–Co alloy, the similar dependence of Kur on R was observed, although the sign in Kur was changed from negative to positive for R around 30%. For the 20%Ni–Co alloy, the values of Kur was found to increase with R and to be about 4×105 erg/cm3 at R=60%.
The results are discussed in terms of the magnetoelastic coupling energy associated with lattice defects and also in connection with the slip induced directional order.
