Positron annihilation lifetime characterization of oxygen ion irradiated rutile TiO2
Abstract
Ferromagnetic ordering at room temperature has been induced in rutile phase of TiO2 polycrystalline sample by O ion irradiation. 96 MeV O ion induced defects in rutile TiO2 sample has been characterized by positron annihilation spectroscopic techniques. Positron annihilation results indicate the formation of cation vacancy (VTi, Ti vacancy) in these irradiated TiO2 samples. Ab initio density functional theoretical calculations indicate that in TiO2 magnetic moment can be induced either by creating Ti or O vacancies.
- Publication:
-
Nuclear Instruments and Methods in Physics Research B
- Pub Date:
- July 2016
- DOI:
- 10.1016/j.nimb.2016.04.014
- Bibcode:
- 2016NIMPB.379..215L
- Keywords:
-
- Magnetic semiconductor;
- Ion beam irradiation;
- Density-functional theory;
- Positron annihilation spectroscopy;
- Defect induced ferromagnetism