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Title: Tuning the electrical properties of La[sub 0.75]Ca[sub 0.25]MnO₃ thin films by ferroelectric polarization, ferroelectric-field effect, and converse piezoelectric effect
Authors: Zheng, R. K.
Wang, Yu
Wang, Jie
Wong, K. S.
Chan, Helen L. W.
Choy, Chung-loong
Luo, Haosu
Subjects: Lanthanum compounds
Calcium compounds
Magnetic thin films
Colossal magnetoresistance
Lead compounds
Dielectric polarisation
Ferroelectric Curie temperature
Internal stresses
Issue Date: 26-Sep-2006
Publisher: American Physical Society
Source: Physical review B, condensed matter and materials physics, 26 Sept. 2006, v. 74, 094427, p. 1-8.
Abstract: Thin films of La[sub 0.75]Ca[sub 0.25]MnO₃ (LCMO) have been grown on ferroelectric (1−x)Pb(Mg[sub ⅓]Nb[sub ⅔])O₃-xPbTiO₃(x~0.33) single-crystal substrates. The ferroelectric polarization in the PMN-PT substrates gives rise to a decrease in resistance and an upward shift in Curie temperature of the LCMO films, which was interpreted in terms of the ferroelectric polarization induced lattice strain effect. The resistance of the LCMO films can be modulated by applying dc/ac electric fields across the polarized PMN-PT substrates. The electric field induces lattice strains in the PMN-PT substrates via the converse piezoelectric effect, which subsequently changes the strain state and resistance of the LCMO films. A quantitative relation between the resistance in the LCMO films and the induced lattice strains in the PMN-PT substrates has been established. Moreover, we identified that the ferroelectric polarization and converse piezoelectric effect induced lattice strain effects dominate over the field effect in the LCMO/PMN-PT systems.
Rights: Physical Review B © 2006 American Physical Society. The Journal's web site is located at
Type: Journal/Magazine Article
ISSN: 1098-0121
Appears in Collections:MRC Journal/Magazine Articles
AP Journal/Magazine Articles

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