University of Groningen
Defect ferromagnetism in ZnO and SnO2 induced by non-magnetic dopants Akbar, Sadaf
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Publication date: 2017
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Akbar, S. (2017). Defect ferromagnetism in ZnO and SnO2 induced by non-magnetic dopants. University of Groningen.
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Propositions
belonging to the thesis
Defect Ferromagnetism in ZnO and SnO2 induced by
non-magnetic dopants by
Sadaf Akbar, 24th February, 2017
1. Defect ferromagnetism can be induced in metal oxide by non-magnetic dopants by stabilizing intrinsic magnetic defects in thin films and nanoparticles. (Chapter 3 and 5)
2. Carbon substitution at zinc sites and formation of carbon defect complexes play a vital role for the stabilization of cation vacancies and thus support the development of ferromagnetism in ZnO. (Chapter 3 and 4)
3. In Zn doped SnO2 the morphology of the nanostructures varies with zinc concentration
and the stronger ferromagnetic response comes from nanostructures with nanoneedles on their surfaces. This is related to the role of the (110) and (101) planes of the nanoneedles in stabilization of ferromagnetic defects (Chapter 5)
4. The singly ionized oxygen vacancies act as recombination centres for the luminescence process in Zn doped SnO2 nanoparticles. (Chapter 6)
5. X-ray photoemission spectroscopy is a suitable analytical tool to identify the chemical state of Zinc (Chapter 5) and Li (Chapter 7) in SnO2.
6. Li is less effective as a ferromagnetic defect in SnO2 nanoparticles as compared to Zn.
(Chapter 7)
7. It is the mark of an educated mind to be able to entertain a thought without accepting it. (Aristotle)
8. Life, like the arts of poetry and painting, is wholly expression. Contemplation without action is death (Allama Iqbal)
9. A PhD candidate should not be haunted by the word ‘publication’. The desideratum for noble scientific work and the thirst for knowledge should be the true and only objectives.
10. A researcher’s life is not just to attain a PhD degree, indeed it is the most preferable and prestigious style of living life.
11. The trust of people who believe in your skills makes you perform incredible and impossible tasks of your life.
