Abstract
The effects of radiation thermomagnetic treatment (RTMT) (as compared with thermomagnetic treatment) on Co-containing ferrospinels have been investigated. The RTMT of ferrites results in the appearance of an induced magnetic anisotropy, which improves the magnetic properties, particularly the remanence, maximal magnetic permeability and hysteresis loop squareness. The effects of RTMT are most evident in ferrites containing divalent cobalt ions in octahedral sites. The induced magnetic anisotropy arises from radiation-induced diffusion of vacancies, magnetic ions and radiation defects. The role of the irradiation temperature is discussed. The use of a periodic magnetic field during irradiation is considered in order to increase the radiation stability of the hysteresis loop parameters.
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