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

Abstract

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 2$p$$\to 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.

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References in corpus (3)

• Absence of ferromagnetism in Co and Mn substituted polycrystalline ZnO
• Absence of room temperature ferromagnetism in bulk Mn-doped ZnO
• Nature of magnetic coupling between Mn ions in as-grown Ga${}_{1-x}$Mn${}_x$As studied by x-ray magnetic circular dichroism

Cited by in corpus (2)

• Theory of the $sp-d$ coupling of transition metal impurities with free carriers in ZnO
• Spin-polarized electronic structure of the core-shell ZnO/ZnO:Mn nanowires probed by x-ray absorption and emission spectroscopy