Journal
PHYSICAL REVIEW B
Volume 63, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.63.132103
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We study the dielectric response of ferroelectric (FE) thin films with the dead dielectric layer at the interface with electrodes. The domain structure inevitably forms in the FE film in the presence of the dead layer. As a result, the effective dielectric constant of the capacitor epsilon (ff) increases abruptly when the dead layer is thin and, consequently, the pattern of 180 degrees domains becomes soft. We compare the exact results for this problem with the description in terms of a popular capacitor model, which is shown to give qualitatively incorrect results. We relate the present results to fatigue observed in thin ferroelectric films.
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