The Effects of Irradiation on Magnetic Properties of Alloys and Ferrites
Studies were made on the effects of neutron irradiation on the magnetic characteristics of metal alloys and ferrites. The magnetic properties included the coercive force, remanence, shape of the hysteresis loop, Curie temperature, and magnetic moment. Only the Curie temperature, was found to be relatively insensitive to neutron irradiation; all the other properties were modified by varying amounts. The radiation sensitivity of metal alloys and selected ferrites appears to be primarily related to the dependence of magnetic properties on the shortrange ordering of the atoms along certain crystallographic directions. Materials which can be easily ordered show the greatest sensitivity. It has been found that the application of a magnetic field during irradiation can cause directional ordering to take place which in many cases produces more desirable magnetic characteristics. The studies of the ferrites are more complicated since the effects appear to be related to atomic displacements as well as possible radiation induced oxidation. This has been deduced from magnetic measurements of irradiated samples coupled with neutron diffraction data of the same material. (Author).
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