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Sökning: L773:9781605112695

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1.
  • Biswas, Anis, et al. (författare)
  • The effect of oxygen partial pressure during deposition in the magnetic properties of ZnO thin film
  • 2011
  • Ingår i: Mater Res Soc Symp Proc. - : Springer Science and Business Media LLC. - 9781605112695 ; , s. 117-122
  • Konferensbidrag (refereegranskat)abstract
    • We have studied the magnetic properties of 100 nm thick ZnO thin films prepared by magnetron sputtering in different oxygen partial pressures (ratio of oxygen pressure to total pressure in deposition chamber, P Oxy). Only the films fabricated at P Oxy below ∼ 0.5 show room temperature ferromagnetism. The saturation magnetization at room temperature is initially found to increase as P Oxy increases and reaches maximum value of ∼ 5 emu/gm at P Oxy ∼ 0.3 and then starts to decrease and becomes diamagnetic for P Oxy > 0.5. From small angle XRD study of structural properties of the films, we find that the lattice stress developed in the film along c-axis also exhibits a similar behavior with the variation of P Oxy. Thus, both the room temperature ferromagnetism and lattice stress appear to originate from the intrinsic defects present in the sample.
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2.
  • Wu, Yan, et al. (författare)
  • 'In-situ' solution processed room temperature ferromagnetic MgO thin films printed by inkjet technique
  • 2011
  • Ingår i: Materials Research Society Symposium Proceedings. - : Springer Science and Business Media LLC. - 9781605112695 ; , s. 105-109
  • Konferensbidrag (refereegranskat)abstract
    • We report on 'in-situ' solution processed homogeneous (200) oriented MgO ∼85nm thin films deposited on Si substrates by inkjet printing. These films are found to show ferromagnetic order beyond room temperature with a saturation magnetization MS as high as ∼0.63 emu/g. X-ray photoelectron spectroscopy investigations show the absence of any possible contamination effects, while the Mg 2p, and O 1s spectra indicate that the role of defect structure at the Mg site is important in the observed magnetism. By controlling the pH values of the precursors the concentration of the defects can be varied and hence tune the magnetization at room temperature. The origin of magnetism in these MgO thin films appears to arise from the cation vacancies.
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  • Resultat 1-2 av 2
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refereegranskat (2)
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Rao, K. Venkat (2)
Biswas, Anis (1)
Belova, Lyubov (1)
Nagar, Sandeep (1)
Wu, Yan (1)
Zhan, Y (1)
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Shirong, Wang (1)
Belova, Liubov (1)
Fahlman, M. (1)
Fang, Mei (1)
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Kungliga Tekniska Högskolan (2)
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2011 (2)

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