TY - JOUR
T1 - Preparation of monoclinic 0.9(BiFeO3)-0.1(BiCoO3) epitaxial films on orthorhombic YAlO3 (100) substrates by r.f. magnetron sputtering
AU - Ichinose, T.
AU - Naganuma, H.
AU - Mukaiyama, K.
AU - Oogane, M.
AU - Ando, Y.
N1 - Funding Information:
Authors (N.I and H.N.) thank Dr. S. Yasui, Tokyo Institute of Technology, for discussion of crystal structure. This work was partly supported by a KAKENHI Grant-in-Aid for Challenging Exploratory Research (No. 25600067 ), by the Strategic International Cooperative Program (joint research type), Grant-in-Aid for Scientific Research (S) (No. 24226001 ), Japan Science and Technology Agency “Advanced Spintronic Materials and Transport Phenomena (ASPIMATT)”, and by NEDO , Japan ( 11B07018d ).
Publisher Copyright:
© 2014 Elsevier B.V. All rights reserved.
PY - 2015/1/1
Y1 - 2015/1/1
N2 - 0.9BiFeO3-0.1BiCoO3 (BFCO) films (t=100 nm) were prepared on orthorhombic YAlO3 (YAO) (100) substrates by r.f. magnetron sputtering. Film flatness, crystallinity, crystal symmetry, and secondary phase formation are strongly affected by the pressure of the sputtering gasses, Ar and O2. Phi-scan measurements showed that the films were epitaxially grown on the substrates, with the crystal relation [101]p(101)p BFCO||[101]p(101)p YAO. X-ray reciprocal space mapping revealed that the crystal symmetry of the BFCO films was a pseudo-cubic-like monoclinic structure, with MC phase, rather than the Cm symmetry of the bulk BFCO. Cross-sectional transmission electron microscopy analysis revealed that the film had, as a result of a lattice misfit of 7%, strong compressive strain less than 10 nm from the interface, which relaxed monotonically with increasing distance from the interface. Magnetic measurements show that strained monoclinic BFCO has smaller magnetization compared to rhombohedral BFCO.
AB - 0.9BiFeO3-0.1BiCoO3 (BFCO) films (t=100 nm) were prepared on orthorhombic YAlO3 (YAO) (100) substrates by r.f. magnetron sputtering. Film flatness, crystallinity, crystal symmetry, and secondary phase formation are strongly affected by the pressure of the sputtering gasses, Ar and O2. Phi-scan measurements showed that the films were epitaxially grown on the substrates, with the crystal relation [101]p(101)p BFCO||[101]p(101)p YAO. X-ray reciprocal space mapping revealed that the crystal symmetry of the BFCO films was a pseudo-cubic-like monoclinic structure, with MC phase, rather than the Cm symmetry of the bulk BFCO. Cross-sectional transmission electron microscopy analysis revealed that the film had, as a result of a lattice misfit of 7%, strong compressive strain less than 10 nm from the interface, which relaxed monotonically with increasing distance from the interface. Magnetic measurements show that strained monoclinic BFCO has smaller magnetization compared to rhombohedral BFCO.
KW - A1. Monoclinic
KW - B1. BiCoO
KW - B1. BiFeO
KW - B1. Perovskites
KW - B1. YAlO substrates
KW - B2. Multiferroics
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U2 - 10.1016/j.jcrysgro.2014.09.044
DO - 10.1016/j.jcrysgro.2014.09.044
M3 - Article
AN - SCOPUS:84908374260
VL - 409
SP - 18
EP - 22
JO - Journal of Crystal Growth
JF - Journal of Crystal Growth
SN - 0022-0248
ER -