Magnetic Properties of the Iron-Nickel Alloys Under Hydrostatic Pressure

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Abstract
A series of well annealed iron‐nickel alloys in nominal steps of 10 percent Ni, including pure iron and pure nickel, has been examined for the effect of pressures, up to 12,500 kg/cm2, on the magnetic flux density. The application of pressure to a well annealed specimen causes a relatively large change in flux, usually a decrease and an incomplete recovery on release of pressure. The recovery is reversible in the sense that the same curve of flux change is traced with each series of pressure applications, provided the measuring pressure does not exceed that first applied. The 30 percent Ni alloy is rendered nearly nonmagnetic by a pressure of 12,000 kg/cm2. In the remaining metals pure iron exhibits the greatest and 90 percent Ni the smallest pressure change of flux. At constant field the different alloys exhibit various types of pressure changes of flux; linear, nonlinear and types exhibiting hysteresis.

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