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Switching Time in Ferroelectric BaTiO3 and Its Dependence on Crystal Thickness

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1 Author(s)
Merz, Walter J. ; Bell Telephone Laboratories, Inc., Murray Hill, New Jersey

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The switching time ts and the switching current imax have been measured as a function of applied field E and of the size of the sample. It has been observed that the ``activation field'' α for the nucleation of new domains is inversely proportional to the thickness of the sample. This behavior can be explained by assuming a surface layer. The thickness of this layer has been calculated to be of the order of 10-4 cm. The same way we can explain the thickness dependence of the 60‐cycle coercive field strength. Furthermore, it has been found that the switching time depends to a first approximation linearly on the thickness of the sample if the field E is kept constant. This can be explained by assuming a domain wall motion primarily in the forward direction or by assuming a nucleation mechanism. The maximum velocity of the domain growth was found to be of the order of the velocity of sound. The switching time does not depend on electrode area.

Published in:

Journal of Applied Physics  (Volume:27 ,  Issue: 8 )