SATURATION MAGNETOSTRICTION DEPENDENCE ON TORSION IN AMORPHOUS WIRE AS MEASURED BY MODIFIED SMALL-ANGLE MAGNETIZATION ROTATION METHOD

The small angle magnetization rotation (SAMR) method has been applied to the measurement of the torsional dependence of the saturation magne tostriction in a low-magnetostrictive amorphous Go-rich wire. The beha viour of the electric signal picked up from the sense coil has been in vestigated using experimental and numerical methods. The torsion intro duces the first harmonic into the signal but the general formula for t he measurement of the saturation magnetostriction remains valid. The c onditions for the application of the method are discussed, The measure ments of the saturation magnetostriction in the presence of an applied torsion have been carried out for as-quenched and annealed samples us ing different intensities of the annealing current. The magnetostricti on coefficient, lambda(s), depends linearly on the applied stress sigm a. lambda(s), = lambda(s)(0) + A sigma. The experimental dependence of the parameters lambda(s)(0) and A on the applied torsion and for diff erent thermal treatments of the samples are also presented.