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The microstructure and magnetic property of TiO 2 ‐terminated SrTiO 3 substrate selected growth cubic phase CaRuO 3 film
Author(s) -
Zhang Lunyong,
Zhou Jian,
Zhang ShanTao,
Chen Y. B.,
Chen YanFeng
Publication year - 2013
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201300137
Subject(s) - materials science , nucleation , microstructure , transmission electron microscopy , thin film , substrate (aquarium) , layer (electronics) , ferromagnetism , crystallography , phase (matter) , pulsed laser deposition , hysteresis , cubic crystal system , nanotechnology , composite material , condensed matter physics , chemistry , physics , organic chemistry , oceanography , geology
CaRuO 3 thin films with various thicknesses were synthesized by pulsed laser deposition respectively on SrTiO 3 substrates with SrO‐ and TiO 2 ‐termination. The microstructure of these films was studied by transmission electron microscopy. The results demonstrate that the CaRuO 3 thin films grown on TiO 2 ‐terminated substrates show quite uniform morphology, whilst they do the facet morphology when the substrates are SrO‐terminated. In addition, there is a 5∼7 unit‐cell‐thickness cubic CaRuO 3 layer in the films grown on TiO 2 ‐terminated substrates. The measured ferromagnetic hysteresis loop is attributed to the cubic CaRuO 3 layer, which is supported by a first‐principles calculations. On the contrary, there is free of cubic CaRuO 3 layer in samples grown on SrO‐terminated substrates. The crystallographic domains, the orientation relationship between domains and substrates and crystal defects in these films were studied as well. The different growth mechanism of CaRuO 3 on SrO‐ and TiO 2 ‐terminated SrTiO 3 substrates may be correlated with the selective nucleation and growth.