Browsing by Author "Nefedov A."

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  • Dose dependence of ferromagnetism in Co-implanted ZnO 
    Akdogan N.; Zabel H.; Nefedov A.; Westerholt K.; Becker H.; Gök S.; Khaibullin R.; Tagirov L. (2009)
    We have studied the structural, magnetic, and electronic properties of Co-implanted ZnO(0001) films grown on Al2 O3 (11 2- 0) substrates for different implantation doses and over a wide temperature range. Strong room ...
  • Dose dependence of magnetism in Co-doped TiO2 
    Akdogan N.; Nefedov A.; Westphalen A.; Zabel H.; Khaibullin R.; Tagirov L. (2007)
    The dose dependence of magnetism in Co-implanted TiO2 rutile was investigated using the magneto-optic Kerr effect method at room temperature. The (100)- and (001)-oriented single-crystalline rutile TiO2 plates were used ...
  • High-temperature ferromagnetism in Co-implanted TiO2 rutile 
    Akdogan N.; Nefedov A.; Zabel H.; Westerholt K.; Becker H.; Somsen C.; Gök A.; Bashir A.; Khaibullin R.; Tagirov L. (2009)
    We report on structural, magnetic and electronic properties of Co-implanted TiO2(1 0 0) rutile single crystals for different implantation doses. Strong ferromagnetism at room temperature and above is observed in TiO 2 ...
  • Intrinsic room temperature ferromagnetism in Co-implanted ZnO 
    Akdogan N.; Nefedov A.; Westerholt K.; Zabel H.; Becker H.; Somsen C.; Khaibullin R.; Tagirov L. (2008)
    We report on the structural and magnetic properties of a cobalt-implanted ZnO film grown on a sapphire substrate. X-ray diffraction and transmission electron microscopy reveal the presence of a ( )-oriented hexagonal Co ...
  • Optical and magnetic properties of Ni-implanted and post-annealed ZnO thin films 
    Okay C.; Rameev B.; Güler S.; Khaibullin R.; Khakimova R.; Osin Y.; Akdoǧan N.; Gumarov A.; Nefedov A.; Zabel H.; Aktaş B. (2011)
    Single-crystalline ZnO thin films have been grown on sapphire substrates and implanted by 40 keV Ni+ ions with a dose of 0.25-1.25 × 1017 ions/cm2. After implantation the samples have been annealed at T = 1000°C for 30 ...
  • Spin polarization of oxygen atoms in ferromagnetic Co-doped rutile TiO 2 
    Nefedov A.; Akdogan N.; Zabel H.; Khaibullin R.; Tagirov L. (2006)
    Of central interest in the research of dilute magnetic semiconductors is the coupling mechanism leading to a ferromagnetic ground state. Using x-ray resonant magnetic scattering, we have analyzed the element specific ...

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