Electrical Resistance of Nickel and Iron Wires as Affected by Longitudinal Magnetic Fields

Abstract

In a paper on electrical resistance of nickel and permalloy wires as affected by longitudinal magnetization and tension. L. W. McKeehan pointed out that further investigation and discussion of some special questions regarding change of resistance of ferromagnetic substances in magnetic fields were highly desirable. In the present paper the following subjects are treated, partly on the basis hitherto unpublished measurements by the author. (1) Change of resistance in small fields. As the literature shows, the question whether this is independent of the magnetic history of the sample is not yet settled. Anomalies often observed are not real. (2) The early saturation of the magneto-resistance effect, a condition which is reached in considerably weaker fields with ferromagnetic bodied than with para- and diamagnetic bodies. An explanation on the basis of the electron theory is suggested.