Positron annihilation lifetime characterization of oxygen ion irradiated rutile TiO2

Ferromagnetic ordering at room temperature has been induced in rutile phase of TiO2 polycrystalline sample by O ion irradiation. 96MeV O ion induced defects in rutile TiO2 sample has been characterized by positron annihilation spectroscopic techniques. Positron annihilation results indicate the form...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Beam interactions with materials and atoms, 2016-07, Vol.379, p.215-218
Main Authors: Luitel, Homnath, Sarkar, A., Chakrabarti, Mahuya, Chattopadhyay, S., Asokan, K., Sanyal, D.
Format: Article
Language:English
Subjects:
Defect induced ferromagnetism
Density-functional theory
Ferromagnetism
Ion beam irradiation
Irradiation
Magnetic semiconductor
Order disorder
Positron annihilation
Positron annihilation spectroscopy
Rutile
Titanium
Titanium dioxide
Vacancies
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Summary:Ferromagnetic ordering at room temperature has been induced in rutile phase of TiO2 polycrystalline sample by O ion irradiation. 96MeV 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.
ISSN:0168-583X
1872-9584
DOI:10.1016/j.nimb.2016.04.014