Publication

Effect of ferroelectric polarization on current response of PZT thin films

Nava Setter, Alexander Tagantsev
1995
Journal Articles

Abstract

A strong influence of ferroelectric polarization on d.c. conduction has been observed in PZT thin films with Pt electrodes. It is shown that the current-voltage response taken for measuring times of hundreds of seconds at room temperature is controlled by the crossover from the transient to steady-state conduction regime. In the transient regime the current flowing against the initial direction of the ferroelectric polarization is higher than that flowing in the reverse direction. In the steady-stare regime a current asymmetry of the opposite sense is observed. At elevated temperatures (150-200 degrees C) the asymmetry in both regimes is strongly suppressed. A Maxwell-Wagner relaxation model with ferroelectric and non-ferroelectric capacitors can qualitatively explain the observed phenomena.

Official source

https://infoscience.epfl.ch/entities/publication/41c7ed6a-26a7-48d4-814d-b87c001a88af

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Nava Setter, Alexander Tagantsev
1995
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/41c7ed6a-26a7-48d4-814d-b87c001a88af

About this result

Related concepts (32)

Ferroelectricity

Ferroelectricity is a characteristic of certain materials that have a spontaneous electric polarization that can be reversed by the application of an external electric field. All ferroelectrics are also piezoelectric and pyroelectric, with the additional property that their natural electrical polarization is reversible. The term is used in analogy to ferromagnetism, in which a material exhibits a permanent magnetic moment. Ferromagnetism was already known when ferroelectricity was discovered in 1920 in Rochelle salt by Joseph Valasek.

Current sensing

In electrical engineering, current sensing is any one of several techniques used to measure electric current. The measurement of current ranges from picoamps to tens of thousands of amperes. The selection of a current sensing method depends on requirements such as magnitude, accuracy, bandwidth, robustness, cost, isolation or size. The current value may be directly displayed by an instrument, or converted to digital form for use by a monitoring or control system.

Electric current

An electric current is a flow of charged particles, such as electrons or ions, moving through an electrical conductor or space. It is defined as the net rate of flow of electric charge through a surface. The moving particles are called charge carriers, which may be one of several types of particles, depending on the conductor. In electric circuits the charge carriers are often electrons moving through a wire. In semiconductors they can be electrons or holes.

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Effect of ferroelectric polarization on current response of PZT thin films

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