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High tunability in compositionally graded epitaxial barium strontium titanate thin films by pulsed-laser deposition

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6 Author(s)
Lu, S.G. ; Department of Applied Physics and Materials Research Centre, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China ; Zhu, X.H. ; Mak, C.L. ; Wong, K.H.
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Compositionally graded barium strontium titanate [(BaxSr1-x)TiO3BST, x=0.75, 0.8, 0.9, and 1.0] thin films are fabricated by pulsed-laser deposition on a LaAlO3 substrate with (La0.7Sr0.3)MnO3 as the bottom electrode. A high dielectric permittivity and temperature characteristic without Curie–Weiss law are obtained. A tunability of over 70% is obtained at frequency of 1 MHz, which is higher than that of single BST layer with the same compositions. All the results indicate that the graded thin films have better electrical properties than a single-layer film. © 2003 American Institute of Physics.

Published in:

Applied Physics Letters  (Volume:82 ,  Issue: 17 )

Date of Publication:

Apr 2003

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