From a non-magnet to a ferromagnet: Mn~+ implantation into different TiO_2 structures

摘要

We report effect of the initial structural order on the resulting magnetic properties of manganese implanted TiO_2 films. Different microstructures of as-grown TiO_2 films, namely, amorphous, poly-crystalline anatase, and epitaxial anatase, have been implant-doped with Mn~+ up to a concentration of 5 at. %. We found that different initial structures lead to different defect and charge carrier concentrations and, as a result, strongly influence the magnetic properties upon implantation. Depending on the initial microstructure, paramagnetism, secondary phases related magnetic properties as well as ferromagnetism could be observed in the films.