On the nature of radiation damage due to fast neutron bombardment in ferromagnetic materials: very high permeability pure iron and nickel
The effects of fast neutron irradiation with doses of 1018 nvt on permeability, coercive force and approach to saturation of very high permeability pure iron and nickel were studied. No significant changes were noted on nickel (maximum permeability 5000). On iron (maximum permeability about 150 000,H c 2.5 A/m) coercive force increased by about 0.8 A/m, maximum permeability decreased by about 30%, and no change was noted in the curve of approach to saturation and hence in the anisotropy energy. After annealing the irradiated iron specimens at 100 °C, a further increase of coercive force was observed, and after annealing at 200 °C, on one of the specimens a loop with strong waspwaisted form was noted. Finally most of the changes in magnetic properties due to irradiation were almost completely recovered below 250 °C. The possible theoretical interpretations of the results are discussed. The kinetics of the annealing leads to exclude that the effects are due to free iron interstitials and probably also to dislocations loops. Finally, therefore it shall be thought of some type of anisotropic point defects which interact with the magnetization vector and move with and activation energy of about 1.2 eV at temperatures of (100÷200) °C.
- Research Organization:
- C.N.R., Turin
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-15-024069
- OSTI ID:
- 4036745
- Journal Information:
- Nuovo Cimento, Journal Name: Nuovo Cimento Journal Issue: 4 Vol. 20; ISSN 0029-6341
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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