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Sökning: L773:2331 7019 > (2014)

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1.
  • Nguyen, T. N. Anh, et al. (författare)
  • Depth-Dependent Magnetization Profiles of Hybrid Exchange Springs
  • 2014
  • Ingår i: Physical Review Applied. - 2331-7019. ; 2:4
  • Tidskriftsartikel (refereegranskat)abstract
    • We report on the magnetization depth profile of a hybrid exchange-spring system in which a Co/Pd multilayer with perpendicular anisotropy is coupled to a CoFeB thin film with in-plane anisotropy. The competition between these two orthogonal anisotropies promotes a strong depth dependence of the magnetization orientation. The angle of the magnetization vector is sensitive both to the strength of the individual anisotropies and to the local exchange constant and is thus tunable by changing the thickness of the CoFeB layer and by substituting Ni for Pd in one layer of the Co/Pd stack. The resulting magnetic depth profiles are directly probed by element-specific x-ray magnetic circular dichroism of the Fe and Ni layers located at different average depths. The experimental results are corroborated by micromagnetic simulations.
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2.
  • Stehr, Jan Eric, et al. (författare)
  • Zinc-Vacancy–Donor Complex : A Crucial Compensating Acceptor in ZnO
  • 2014
  • Ingår i: Physical Review Applied. - : American Physical Society. - 2331-7019. ; 2:021001
  • Tidskriftsartikel (refereegranskat)abstract
    • The aluminum–zinc-vacancy (Al Zn −V Zn ) complex is identified as one of the dominant defects in Al-containing n -type ZnO after electron irradiation at room temperature with energies above 0.8 MeV. The complex is energetically favorable over the isolated V Zn , binding more than 90% of the stable V Zn ’s generated by the irradiation. It acts as a deep acceptor with the (0/− ) energy level located at approximately 1 eV above the valence band. Such a complex is concluded to be a defect of crucial and general importance that limits the n -type doping efficiency by complex formation with donors, thereby literally removing the donors, as well as by charge compensation.
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