Browsing by Author "Kopal, Antonín"
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- ItemDomain formation in thin ferroelectric films: The role of depolarization energy(1997) Kopal, Antonín; Bahník, Tomáš; Fousek, JanFormulae for equlibrium stripe domain width Weq in a nonductive ferroelectric plate of thickness d are deduced, taking into account electrostatic interaction of surfaces. It is shown that the classical formula giving W eq ∞ d 1/2 is not applicable when the sample thickness decreases below the value dcrit which is a function of dielectric properties and domain wall energy density. For many ferroelectrics the value of dcrit lies in a range which can be easily reached far below the transition point by contemporary thin film techniques; it further increases as the transition point is approached. In the region d < dcrit the width Weq increases with decreasing d. For samples with thickness d << dcrit the domain structure becomes insensitive to electrical boundary conditions and will be primarily determined by other factors.
- ItemFyzika I : mechanika, kmitání, vlnění, termodynamika(2009) Kopal, Antonín
- ItemPříklady z fyziky I : mechanika : kmity, vlny : nauka o teple(2011) Kopal, Antonín; Machonský, Lubor; Šimek, Ladislav; Čmelík, Milan; Burianová, Lidmila; Kazda, Václav
- ItemPříklady z fyziky II : elektromagnetizmus, optika, jaderná fyzika, fyzika pevných látek(2009) Kopal, Antonín