Permeabilities, hysteresis loops and domain patterns of sputtered permalloy films which have various magnetostriction constants were studied. The films were striped, stepped and finally coated by sputtered Alumina films. The magnetic characteristics of these films were different from that of the sheeted films. The experimental results can be explained by the induced uniaxial stresses of the films for each shape. The magnetostriction con-stant is an important magnetic property of the permalloy film for thin film heads.
