Magnetic resonance on oriented 131I nuclei in iron. A study of magnetization behaviour, implantation damage and nuclear spin-lattice relaxation in iron single crystals.

In this thesis we describe experiments on 131I implanted into iron single crystals. At low temperatures the nuclei, experiencing a hyperfine field coupled to the local direction of magnetization of the iron, will orient themselves. From the angular distribution of the emitted y-radiation one can derive the state of magnetization of the sample. We have shown that the magnetization behaviour of iron single crystals in an external magnetic field agrees with the macroscopic theory of domain structure in ferromagnets. This knowledge is used to give the influence of the external field on NMR measurements on the iodine. The resonance is observed by detection of the y-radiation. The iodine atoms that end up in regular lattice sites after the implantation give rise to a strong resonance. ... Zie: Summary