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Structural Evidence for Zn Intersititials in Ferromagnetic Zn 1– x Co x O Films
Author(s) -
MacManusDriscoll J. L.,
Khare N.,
Liu Y.,
Vickers M. E.
Publication year - 2007
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200602215
Subject(s) - materials science , ferromagnetism , annealing (glass) , zinc , epitaxy , lattice constant , analytical chemistry (journal) , interstitial defect , condensed matter physics , lattice (music) , crystallography , metallurgy , nanotechnology , optoelectronics , optics , diffraction , chemistry , physics , layer (electronics) , chromatography , acoustics , doping
Post‐annealing studies in different atmospheres combined with high resolution x‐ray studies on epitaxial ZnO and Zn 1–x Co x O films revealed that the c ‐axis lattice parameter decreases when interstitial zinc is removed from ZnO. The ‘ c ' parameter change reverses sign when samples are re‐annealed in a Zn‐rich atmosphere. Stronger ferromagnetism occurs in Zn 1–x Co x O film for higher ‘c' parameters and hence higher Zn interstitial concentrations.