Some magnetic properties of dilute ferromagnetic alloys

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Abstract
Previous experiments (1955) have been carried out by the author on the magnetic properties of precipitates of dilute ferromagnetic alloys precipitated from solid solutions in non-ferromagnetic matrices. This process could be followed from the initial stages of superparamagnetism through single to multi-domain size of the aggregates, and the magnetic measurements correlated with particle growth. In the present communication, the work is extended to the production of precipitates in which departure from spherical shape is produced by cold drawing of suitable alloys. Magnetic measurements on the anisotropic specimens so produced are shown to give evidence for the distribution of particle shape, size and structure. The reverse magnetic field required to reduce the remanence to zero is shown to be an additional useful parameter in these determinations. Microphotographs of the samples showed that in all three cases the precipitates of the specimens of maximum coercivity were larger than would have been expected from single domain particles. Experiments are being continued

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