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Critical properties of symmetric nanoscale metal–ferroelectric–metal capacitors / Yue Zheng in Acta materialia, Vol. 58 N° 8 (Mai 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 8 (Mai 2010) . - pp. 3050–3058 Titre : Critical properties of symmetric nanoscale metal–ferroelectric–metal capacitors Type de document : texte imprimé Auteurs : Yue Zheng, Auteur ; M.Q. Cai, Auteur ; C.H. Woo, Auteur Année de publication : 2011 Article en page(s) : pp. 3050–3058 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Ferroelectric  Curie  temperature  Critical  thickness  Stability  analysis Résumé : The size, surface and interface effects on the magnitude and stability of spontaneous polarization in a symmetric nanoscale ferroelectric capacitor were studied by analyzing its evolutionary trajectory based on a thermodynamic model. Analytic expressions of the Curie temperature, spontaneous polarization, critical thickness and the Curie–Weiss relation were derived, taking into account the effects of the depolarization field, built-in electric field, interfaces and surfaces. Our results show that the critical properties are not only functions of the ambient temperature, misfit strain and electromechanical boundary conditions, but also depend on the characteristics of electrodes, surfaces and interfaces, through the incomplete charge compensation, near-surface variation of polarization and work function steps of ferroelectric–electrode interfaces, which are adjustable. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410000534 [article] Critical properties of symmetric nanoscale metal–ferroelectric–metal capacitors [texte imprimé] / Yue Zheng, Auteur ; M.Q. Cai, Auteur ; C.H. Woo, Auteur . - 2011 . - pp. 3050–3058. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 8 (Mai 2010) . - pp. 3050–3058 Mots-clés : Ferroelectric  Curie  temperature  Critical  thickness  Stability  analysis Résumé : The size, surface and interface effects on the magnitude and stability of spontaneous polarization in a symmetric nanoscale ferroelectric capacitor were studied by analyzing its evolutionary trajectory based on a thermodynamic model. Analytic expressions of the Curie temperature, spontaneous polarization, critical thickness and the Curie–Weiss relation were derived, taking into account the effects of the depolarization field, built-in electric field, interfaces and surfaces. Our results show that the critical properties are not only functions of the ambient temperature, misfit strain and electromechanical boundary conditions, but also depend on the characteristics of electrodes, surfaces and interfaces, through the incomplete charge compensation, near-surface variation of polarization and work function steps of ferroelectric–electrode interfaces, which are adjustable. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410000534