Temperature Dependence of the Magnetic Properties of Nickel-Iron Alloys

Abstract

The effect of temperature on the magnetic properties of six commercially available nickel-iron alloys is reported for the temperature range −60°C to +250°C. The trade names of the alloys are: Hipernik, Deltamax, Hipernik V, Supermalloy, 4-79 Mo-Permalloy, and Hymu 80. The temperature dependence of both ac and dc magnetic properties was determined experimentally over the temperature range. Dc properties were measured by the standard ballistic testing method. At each test temperature sufficient data was taken to plot a normal magnetization curve. Remanent induction and coercive force were also determined at each temperature, these properties being measured relative to magnetizing forces in excess of 100 oersteds. Ac properties were measured by means of a modified Hay bridge, the tests being conducted at frequencies of 60, 400, and 1000 cps. At each test temperature, and for each frequency, total core loss was measured at various inductions in the range characteristic of the alloy being tested. The data presented are the average of the results of tests on six samples of each alloy.