منابع مشابه
First-principles modeling of strain in perovskite ferroelectric thin films
We review the role that first-principles calculations have played in understanding the effects of substrate-imposed misfit strain on epitaxially grown perovskite ferroelectric films. We do so by analyzing the case of BaTiO3, complementing our previous publications on this subject with unpublished data to help explain in detail how these calculations are done. We also review similar studies in t...
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The hysteresis properties of ferroelectric thin films open an elegant and promising way to build nonvolatile memory cells. Our basic goal is to set up a tool which is able to reproduce the macroscopic behavior of the devices by calculating current, voltage and charge at the contacts correctly. Our tool, MINIMOS-NT, provides a rigorous approach to describe the static hysteresis properties of fer...
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A fundamental issue in ferroic systems (ferromagnetic and ferroelectric) is the scaling of the order parameter (magnetization or polarization) with size. Specifically, in ferroelectric thin films, deviations in the polarization can occur due to: (i) competition between thermal vibrations and the correlation energy (which aligns the dipoles); (ii) damage during fabrication. These deviations will...
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A thermodynamic formalism is developed to calculate the pyroelectric coefficients of epitaxial ~001! Ba0.6Sr0.4TiO3 ~BST 60/40! and Pb0.5Zr0.5O3 ~PZT 50/50! thin films on ~001! LaAlO3 , 0.29 LaAlO3 :0.35(Sr2TaAlO6) ~LSAT!, MgO, Si, and SrTiO3 substrates as a function of film thickness by taking into account the formation of misfit dislocations at the growth temperature. The role of internal str...
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Modern wireless communication systems are based on microwave technologies. Ferroelectric devices with the electric field dependent dielectric properties and low dielectric losses at microwave frequencies are very promising. Capacitance tunability nc, defined as the ratio of the capacitance at zero applied bias voltage to the capacitance at some desired applied voltage, is the key functional pro...
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ژورنال
عنوان ژورنال: Journal of Materials Science
سال: 2009
ISSN: 0022-2461,1573-4803
DOI: 10.1007/s10853-009-3553-1