Abstract
Abstract Magnetic relaxation measurements are reported on high-purity and carbon-charged cobalt following irradiation with 3 MeV electrons. The temperature of irradiation was either 10 or 30 K and the dose 1023 m−2. Attention is focused on the annealing behaviour which occurs in recovery stages I and III. In stage I (12–60 K), only one stable relaxation builds up during anneal; this is interpreted as being due to the reorientation of a Frenkel pair which stabilizes at the start of the stage I anneal. In the stage III anneal (220–400 K), no new relaxation peaks are formed in pure cobalt; in carbon-charged samples a relaxation is observed at 57 K, which is attributed to the reorientation of a complex formed by the trapping of the mobile stage III defect at interstitial carbon.
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