Applied Physics Letters · 2007 · 17 citations · 12 references
Natural SciencesElectrical EngineeringMaterials ScienceElectronic MaterialsMicroelectronicsMicrowave EngineeringDielectricsFerroelectric CeramicsFerroelectric MaterialsMicrowave MaterialsMicrowave Semiconductor DevicesThin Film Electrical PropertiesCapacitanceDielectric RelaxationFerroelectric CapacitorsFerroelectric RelaxationFerroelectric Thin FilmsRelaxation ProcessesTuningVaractor Tuning
Significant difference in the capacitance tunability of paraelectric state ferroelectric capacitors under dc and pulse voltages is demonstrated. Along with a fast tuning (τ<10ns) the slow relaxation processes (τ⩾100s) responsible for up to ∼30% variation of the capacitance were observed. The observed effect is a main obstacle for application of paraelectric state ferroelectrics on microwaves.
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