TITLE

Epitaxial growth and properties of metastable BiMnO[sub 3] thin films

AUTHOR(S)
Moreira dos Santos, António F.; Cheetham, Anthony K.; Tian, Wei; Pan, Xiaoqing; Jia, Yunfa; Murphy, Nathan J.; Lettieri, James; Schlom, Darell G.
PUB. DATE
January 2004
SOURCE
Applied Physics Letters;1/5/2004, Vol. 84 Issue 1, p91
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Epitaxial thin films of BiMnO[sub 3] were deposited on single-crystal substrates of (100)-oriented SrTiO[sub 3] by pulsed-laser deposition. Structural analysis by x-ray diffraction, electron diffraction, and transmission electron microscopy (TEM) indicated that the films were monoclinic and twinned with two dominant orientation relationships. The first is (111) BiMnO[sub 3] ∥ (100) SrTiO[sub 3] and ∼[101] BiMnO[sub 3] ∥ <010> SrTiO[sub 3]; the second is (101) BiMnO[sub 3] ∥ (100) SrTiO[sub 3] and ∼[121] BiMnO[sub 3] ∥ <010> SrTiO[sub 3]. High-resolution TEM images revealed that there is no reaction or appreciable interdiffusion at the substrate/film interface, despite the high temperature of the substrate during deposition (∼1000 K). Magnetic characterization was carried out (both magnetization versus temperature and hysteresis loops) and the results agree with previous reports of a ferromagnetic transition with T[sub C]∼105 K. The actual value of T[sub C] in the films is a few degrees lower than the bulk material, the discrepancy being attributed to strain, nonstoichiometry, or size effects. © 2004 American Institute of Physics.
ACCESSION #
11805669

 

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