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Volume 6 Research & Reviews: Journal of Material Sciences
ISSN: 2321-6212 Materials Physics 2018
August 16-17, 2018
August 16-17, 2018 | London, UK
4th International Conference on
Condensed Matter and Materials Physics
Room temperature ferromagnetism in various non-magnetic oxides
Homnath Luitel and D Sanyal
VECC, India
Ab-initio calculations on the possibility of room temperature ferromagnetic ordering in non-magnetic oxides have been
performed by doping various p-block elements X (X=B, C, N, Al, Si, P, S, Ga, Ge and As) in ZnO, TiO2, MgO, SnO2 etc.
The spin-polarized density of states calculation has been performed using the code MedeA VASP for all the structures with two
same p-block elements, doped at oxygen sites. A significant amount of induced magnetic moment has been observed in some
cases.The sources of magnetismare np orbital electrons of the dopants along with the 2p orbital electrons of neighboring oxygen
atoms. Among them, stable ferromagnetic (spin triplet) ordering states have been identified and the theoretical calculations
have been verified by experiments. The room temperature ferromagnetic properties of various semiconducting oxides can
be useful for spintronics applications in future. A detailed result of spin-spin interaction study along with our experimental
observations for room temperature ferromagnetism in different systems will be presented.
Figure 1: Local magnetic density distribution for P doped SnO 2. The source of magnetism is the P-atom doped at O-site in SnO2.
Recent Publications
1. Luitel H et al. (2016) Positron annihilation lifetime characterization of oxygen ion irradiated rutile TiO2. Nuclear
Instruments and Methods B. 379:215-218.
2. Luitel H and Sanyal D (2017) Ab initio calculation of magnetic properties in B, Al, C, Si, N, P and As doped rutile TiO 2.
Int. J. Mod. Phys. B. 31:1750227.
3. Luitel H et al. () Defect generation and recovery in polycrystalline ZnO during annealing below 300˚C as studied by in
situ positron annihilation spectroscopy. J. Mat. Sc. 52:7615.
4. Luitel H Roy S and Sanyal D (2018) Ferromagnetism in P and As doped SnO2: first-principle study. Computational
Condensed Matter. 14:36-39.
5. Sarkar A et al. (2017) Positron annihilation spectroscopic characterization of defects in wide band gap oxide.
Semiconductors. Mat. Res. Exp. 4(3):035909.
Biography
Homnath Luitel is a PhD student at Variable Energy Cyclotron Centre (VECC), a research institute in Kolkata. He has done his Post MSc course from the same institute
and has registered for PhD program under Homi Bhabha National Institute (HBNI), Mumbai. His research area mainly focuses on room temperature ferromagnetism in
various non-magnetic semiconducting oxides; and also dilute magnetic semiconductors, defects characterization, etc.
Homnath Luitel et al., Res. Rev. J Mat. Sci. 2018, Volume 6
DOI: 10.4172/2321-6212-C2-017