SATURATION MAGNETOSTRICTION OF AMORPHOUS TAPES WITH LAMBDA-S GREATER-THAN 0 AND LAMBDA-S ALMOST-EQUAL-TO 0 AFTER RELAXATION BY CONVENTIONAL AND RAPID DYNAMIC CURRENT ANNEALING

The saturation magnetostriction lambda-s of amorphous FeSiB (2605-S2) with positive magnetostriction and CoFeMoSiB (6025-vac) with near zero-magnetostriction have been measured after conventional furnace annealing and rapid current annealing above the Curie temperature T(c) using the Tsuya and the cylinder techniques in a high precision dilatometer. The lambda-s values for the two annealing techniques are found to be equivalent, indicating equivalent structural relaxation and chemical order states. It was found that the freely solidified face (air side) of the commercial CoFeMoSiB tapes is fully crystalline and that its near zero lambda-s value is an average value for the crystalline and amorphous volume fractions.