The Wiedemann Effect of the Magnetostriction Alloy 'Alfer'

The Wiedemann effect of "Alfer" (12.91 per cent Al-Fe alloy) was measured at room temperature up to 820 Oe in longitudinal magnetic field and to 8 A in current through the specimens, 3 mm, in diameter and 150 mm in length (the circular magnetic field at the surface of the cylindrical specimen was about 10.7 Oe). It was found that the Wiedemann effect, that is, the angle of twist increased with increasing longitudinal field and after attaining a maximum value decreased gradually at the constant current through the specimen, and that the maximum value as well as the corresponding field increased with increasing current through the specimen. In a weak field, the effect increased at first at a constant rate, and then reaches a saturation value with increasing current, and in higher fields, the effect became proportional to the current. The effect of "Alfer" had the opposite sign to that of Ni, though the absolute magnitudes were nearly equal to each other.