Variation in Orientation Texture of Ultrathin Molybdenum Permalloy Tape

It is necessary to select certain heats of molybdenum Permalloy in order to manufacture cores of ultrathin tape which have satisfactory properties for use in computer applications. In an effort to aid this selection process, quantitative pole density stereograms of {111} poles of $\frac{1}{8}$ mil tapes from six production heats in both cold‐rolled and annealed conditions were developed in order to reveal possible variations in texture and magnetic properties. Cold rolling the tape developed (110)[3¯35] and (110)[33¯5] end orientations as major texture components together with a previously unnoticed cube‐on‐edge or (110)[001] orientation as a minor texture component whose intensity varies according to a combination of many possible processing variables. Annealing the tape at 927°C developed $\text{(120)[001]+(210)[001]}$ ; $\text{(113)[}\overline{78}\text{5]+(113)[785¯]}$ ; and previously unnoticed (110)[001] cube‐on‐edge texture components. The intensity of each individual texture component depends on the combined effect of many processing variables. Switching coefficient, squareness of hysteresis loop $\mathrm{(Br/Bm)}$ and coercive force were used as magnetic parameters for evaluation of the tape cores. It was found that among other possible combinations of texture components a strong (110)[001] annealed texture component seems to associate with the highest squareness ratio and lowest coercive force of the tapes studied in the present investigation. No correlation was found between texture and switching coefficient.