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

T. Kataoka , Y. Yamazaki , V. R. Singh , Y. Sakamoto , A. Fujimori , Y. Takeda , T. Ohkochi , S.-I. Fujimori

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T. Okane Y. Saitoh H. Yamagami A. Tanaka M. Kapilashrami L. Belova K. V. Rao

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classification ❄️ cond-mat.mtrl-sci cond-mat.str-el

keywords xmcdmagneticcirculardichroismionslocalizedparamagneticsignals

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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$$\rightarrow3d$ 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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Ferromagnetism in ZnO co-doped with Mn and N studied by soft x-ray magnetic circular dichroism

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