Journal
APPLIED PHYSICS LETTERS
Volume 90, Issue 17, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2730580
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Epitaxial growth of (0001)-oriented BiFeO3 thin films on the (0001) surface of GaN has been realized using intervening epitaxial (111) SrTiO3 /(100) TiO2 buffer layers. The epitaxial BiFeO3 thin films have two in-plane orientations: [11 (2) over bar0] BiFeO3 parallel to [11 (2) over bar0]GaN plus a twin variant related by a 180 degrees in-plane rotation. BiFeO3 shows an out-of-plane remanent polarization of similar to 90 mu C/cm(2), which is comparable to the remanent polarization of BiFeO3 prepared on (111) SrTiO3 single crystal substrates. The orientation of BiFeO3 realized on GaN provides the maximal out-of-plane polarization of BiFeO3, which is equivalent to a surface charge of 5 x 10(14) electrons/ cm(2). (c) 2007 American Institute of Physics.
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