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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60 cycle hysteresis A. I. Schindler Aaval alignment alloys and ferrites alloys and selected annealing atomic displacements August 11 B(Kg cause directional ordering characteristics of metal coercive force Curie temperature cycle hysteresis loops desirable magnetic characteristics easily ordered show Effect of irradiation effects of neu Effects of radiation ence of magnetic ferromagnetic field applied field during irradiation H(Oer Heusler alloy include the coercive insensitive to neutron irradiated samples coupled IRRADIATION AFTER IRRADIATION IRRADIATION Figure IRRADIATION ON MAGNETIC irradiation with partial magnetic field magnetic hysteresis magnetic properties examined magnetostriction metal alloys modified by varying mumetal Naval Research Laboratory netic neutron diffraction neutron irradiation Ni3Fe partial ordering permalloy permeability post-irradiation hysteresis loops primarily related properties examined include properties were modified radiation sensitivity relatively insensitive remanence result Salkovitz saturating magnetic selected ferrites appears sensitivity of metal shown in Figs supermalloy Surie temperature was found tron irradiation uniaxial anisotropy varying amounts