TITLE

Effect of LaNiO[sub 3] interlayer on dielectric properties of (Ba[sub 0.5]Sr[sub 0.5])TiO[sub 3] thin films deposited on differently oriented Pt electrodes

AUTHOR(S)
Yoon, Ki Hyun; Sohn, Ji-Hoon; Lee, Byoung Duk; Kang, Dong Heon
PUB. DATE
December 2002
SOURCE
Applied Physics Letters;12/23/2002, Vol. 81 Issue 26, p5012
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The (Ba[sub 0.5]Sr[sub 0.5])TiO[sub 3] (BST) thin films were deposited on the LaNiO[sub 3]/Pt(111)/Ti/SiO[sub 2]/Si [LNO/ Pt(lll)] and LaNiO[sub 3]/Pt(200)/SiO[sub 2]/Si [LNO/Pt(200)] substrates by metalorganic deposition process. The BST films directly grown on the Pt(200) and Pt(lll) substrates exhibited random orientation. In case of the LNO/Pt(111) substrates, the BST film was also randomly oriented, but the insertion of LNO interlayer on the Pt(200) substrates caused the growth of (100) textured BST films. The dielectric constant of the 350-nm-thick BST films on LNO/Pt(200) was around 400, which was higher than that of the films on LNO/Pt(111) (around 340). This result was attributed to the fact that the polar axis of the (100) oriented film was more tilted away from the normal to the film surface than that of randomly oriented film. Also, the tunabilities of BST films deposited on the LNO/ Pt(200) and LNO/Pt(111) substrates were nearly 60% and 51% at the applied electric field of 400 kV/cm, respectively. Improved tunability has been attributed to the (100) texture of the film leading to an enhancement of the in-plane oriented polar axis.
ACCESSION #
8691532

 

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