抄録
When a ferromagnetic bar magnetized circularly by a current through it is longitudinally magnetized by anexternal field, the bar will be subjected to torque, which is called the “Wiedemann Effect”.
In this paper the Wiedemann effect of “Alfer” (12.91% Al-Fe alloy) at the room temperature was measured up to 820 Oe in longitudinal magnetic field and to 8A (the circular magnetic field at the surface of the rod was about 10.7 Oe) in current through the specimens, 3 mm in diameter and 150 mm in length.
The Wiedemann effect, namely the angle of twist, of “Alfer” increases at the constant current with an increasing longitudinal field and after attaining a maximum value, gradually decreases. The amount of the maximum value of angle as well as the corresponding field increase with an increasing current through the specimen. In a weak field, the effect increases at first at a constant rate, and then reaches a saturation value with an increasing current, and in high fields, the effect becomes proportional to the current. The effect of “Alfer” has a opposite sign to that of Ni, and those amounts are nearly the same.
