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

Lu, S. G.; Zhu, X. H.; Mak, C. L.; Wong, K. H.; Chan, H. L. W.; Choy, C. L.
April 2003
Applied Physics Letters;4/28/2003, Vol. 82 Issue 17, p2877
Academic Journal
Compositionally graded barium strontium titanate [(Ba[SUBx]Sr[SUB1-x])TiO[SUB3]) -- BST, x = 0.75, 0.8, 0.9, and 1.0] thin films are fabricated by pulsed-laser deposition on a LaAlO[SUB3] substrate with (La[SUB0.7]Sr[SUB0.3])MnO[SUB3] 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.


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