Magnetic behavior of Co and Ni implanted MgO

Single crystals of MgO were implanted with high doses of Co and Ni ions, aiming at the possibility of producing colloidal dispersions of metallic precipitates. Post-implantation annealing in vacuum is used to promote the diffusion of the implanted ions and the recovery of the MgO lattice. Results of magnetization measurements as a function of temperature and magnetic field are presented and correlated with information obtained by Rutherford backscattering measurements in the same samples.