Polycrystalline NiZn ferrite doped with a small amount of Y 3+ ions and having the composition of Ni0.42Zn0.58YxFe2−xO4, where x = 0.00, 0.01, 0.02, 0.04, 0.06, 0.08 and 0.10, was analyzed. Specimens were prepared by the ceramic method. Thermo-magnetic analysis and evaluation of hysteresis loops parameters were chosen as main examination methods in this study. Various parameters, such as Curie temperature TC , coercive eld Hc, remanent magnetic ux density Br, hysteresis loop area and amplitude/initial permeability were studied at low frequencies.
This contribution presents experimental data concerning the inuence of fast heavy ions on magnetic susceptibility of VITROVAC R 6025 and VITROPERM R 800 metallic glasses. Samples of magnetic ribbons were irradiated with Au, and Ta ions at 11.1 MeV/A (energy per nucleon), and U ions at 5.9 MeV/A. The irradiation uences varied from 5 × 10 10 up to 1.2 × 10 13 ions/cm 2 . Relative change of the samples' magnetic susceptibility after and before irradiation was measured and evaluated as a function of the irradiation uence. Measurements were done with a commercial Kappa-bridge device. We observed that VITROPERM R showed less change of magnetic susceptibility in comparison with VITROVAC R and this change occurred at higher uences. This indicates higher radiation hardness of VITROPERM R compared with VITROVAC R against high-energy heavy ions. In addition, heavier ions caused larger change of magnetic susceptibility than the lighter ones and the eect could be roughly scaled with the level of electronic stopping.
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