Synchrotron Photoemission Study of Ferromagnetic (Zn,Co)O Films
E. Guziewicza, M.I. Lukasiewicza, L. Wachnickia, K. Kopalkoa, P. Dłużewskia, R. Jakielaa and M. Godlewskia, b
aInstitute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland
bDepartment of Mathematics and Natural Sciences, College of Science, Cardinal S. Wyszyński University, 01-815 Warsaw, Poland
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The electronic structure of ferromagnetic (Zn,Co)O films was investigated by resonant photoemission across the Co 3p → Co 3d photoionization threshold, e.g. using photon energy between 50 eV and 66 eV. The films were grown by atomic layer deposition at temperature between 160°C and 300°C and they differed in distribution and content of cobalt. The maximum of the Fano resonance was observed at photon energy 63 eV, whereas the minimum at 58 eV. The difference between energy distribution curves taken at 63 eV and the one taken at 58 eV was calculated for a series of samples. It shows that the Co 3d contribution to the valence band electronic structure of ferromagnetic (Zn,Co)O films differs significantly from that of the films which show the paramagnetic response.
DOI: 10.12693/APhysPolA.120.A-40
PACS numbers: 73.20.At, 75.50.Pp, 81.05.Dz, 81.15.Gh