Ferromagnetism in ZnO co-doped with Mn and N studied by soft x-ray magnetic circular dichroism

• We have investigated the electronic structure of ZnO:Mn and ZnO:Mn,N thin films using x-ray magnetic circular dichroism (XMCD) and resonance-photoemission spectroscopy. From the Mn 2p -> 3d XMCD results, it is shown that, while XMCD signals only due to paramagnetic Mn(2+) ions were observed in ZnO:Mn, nonmagnetic, paramagnetic, and ferromagnetic Mn(2+) ions coexist in ZnO:Mn,N. XMCD signals of ZnO:Mn,N revealed that the localized Mn(2+) ground state and Mn(2+) state hybridized with ligand hole coexisted, implying p-d exchange coupling. In the valence-band spectra, spectral weight near the Fermi level was suppressed, suggesting that interaction between magnetic moments in ZnO:Mn,N has localized nature. 

Subject headings

NATURVETENSKAP  -- Fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences (hsv//eng)

Keyword

circular dichroism

exchange interactions (electron)

Fermi level

ferromagnetic materials

ground states

II-VI semiconductors

localised states

magnetic moments

magnetic thin films

manganese

nitrogen

paramagnetic materials

photoelectron spectra

semiconductor thin films

valence bands

zinc compounds

Publication and Content Type

ref (subject category)

art (subject category)