Point-defect interactions in electron-irradiated titanomagnetites—as analysed by magnetic after-effect spectroscopy on annealing within 80 K <Ta <1200 K

During high-temperature growing of titanomagnetite single crystals (Fe2.8-¿Ti0.2O4, ¿ <0.005) in oxygen enriched atmospheres, specific Ti4+- and vacancy-based defect configurations are induced, giving rise to magnetic after-effect (MAE) spectra with peaks near 450, 200 and 65 K. The atomistic mechanisms of these relaxations are checked by exposing the crystals to low-temperature (80 K) electron (e-) irradiation and subsequent analysis of the interactions between radiation-induced and lattice-inherent defects on annealing over the range 80 K