MAGNETIC-ANISOTROPY INDUCED BY COLD-ROLLING IN CO AND CO-FE ALLOYS

The roll reduction and concentration dependencies of the uniaxial magnetic anisotropy induced by cold-rolling, K(ur), were investigated for hexagonal Co and Co-Fe alloys. The maximum value of K(ur) was 3 x 10(5) erg/cm3 at 10%-20% roll reduction for Co and Co-1.5% Fe. The easy direction was perpendicular and parallel to the rolling direction for the alloys containing less than 1.2% Fe and more than 1.2% Fe at room temperature, respectively. The easy direction of K(ur) changed at 260-degrees-C for Co. The texture produced by cold-rolling was detected by Schulz's method. The induced anisotropies were evaluated by using the K(u1), K(u2), and the x-ray reflected intensities. The calculated values and easy direction agreed well with the experimental results. The origin of K(ur) for hexagonal Co and Co-Fe alloys is clearly explained by formation of rolling texture.