Concept

Électret

Publications associées (57)

Physical model of retention and temperature-dependent polarization reversal in ferroelectric films

Nava Setter, Alexander Tagantsev, Igor Stolichnov, Enrico Colla

The phenomenon of time-dependent polarization loss in poled ferroelectric capacitors, also known as retention, represents one of the most important reliability issues for ferroelectric nonvolatile memories. In a number of publications different ways to con ...

2005

Microscopic aspects of the region-by-region polarization reversal kinetics of polycrystalline ferroelectric Pb(Zr,Ti)O-3 films

Nava Setter, Alexander Tagantsev, Igor Stolichnov, Enrico Colla, Lisa Malin

The region-by-region polarization switching in ferroelectric Pb(Zr,Ti)O-3 thin films sandwiched between Pt electrodes has been directly observed using piezoelectric scanning probe microscopy. A resolution improved by one order-of-magnitude compared to the ...

2005

Formation and thermal stability of quasi-amorphous thin films

Alexander Tagantsev

The thermal stability of amorphous ionic solids is usually attributed to kinetic considerations related to mass transport. However, there are a number of amorphous ionic solids, which have recently been described, whose unusual resistance to nucleation and ...

2005

Glass valveless micropump using electromagnetic actuation

Martinus Gijs, Christophe Yamahata, Frédéric Lacharme

We present a valveless micropump in glass, which is magnetically actuated using the sinusoidal current of an external electromagnet. We employ a powder blasting microerosion process for microstructuring the glass substrates and fusion bonding for assembly ...

2005

Kinetics of polarization reversal in ferroelectric films: role of domain nucleation and domain wall motion

Nava Setter, Alexander Tagantsev, Igor Stolichnov, Enrico Colla

Understanding of polarization reversal mechanisms in ferroelectric films is essential for evaluation and prediction of the properties of ferroelectric devices including nonvolatile memories. The widely accepted approach based on the domain wall motion kine ...

2004

Analyse FX des diélectriques commerciaux [XRF analysis of commercial dielectrics]

Thomas Maeder, Caroline Jacq, Sonia Vionnet Menot

Analyse des diélectriques commerciaux : fluorescence X, Infrared absorption, EDX, X-ray Diffraction. Détermination des éléments, déduction des composés par détermination des phases de ceux ci. Tout ceci afin de déterminer les éléments responsables de l’adh ...

2004

Room-temperature ferroelectricity in strained SrTiO3

Alexander Tagantsev

Systems with a ferroelectric to paraelectric transition in the vicinity of room temperature are useful for devices. Adjusting the ferroelectric transition temperature (T-c) is traditionally accomplished by chemical substitution - as in BaxSr1-xTiO3, the ma ...

2004

Properties of thick-film resistors on dielectric and metal substrates for piezoresistive sensors

Peter Ryser, Claudio Grimaldi, Thomas Maeder

In this paper, the resistive and piezoresistive properties of a commercial resistive composition (Du Pont 2041), often used for strain-gauge applications, are examined on several dielectric compositions, which themselves are deposited onto various ceramic ...

2003

Investigation of electrical degradation effects in ferroelectric thin film based tunable microwave components

Nava Setter, Alexander Tagantsev, Konstantin Astafiev

The impact of electrical stressing on the microwave performance of the SrTiO3 films deposited onto different substrates (MgO and LaAlO3) by pulsed laser deposition has been investigated. The most important characteristics of the tunable microwave component ...

2002

Characterization and model of ferroelectrics based on experimental Preisach density

Paul Muralt

In this article an experimental method of characterization and modeling of ferroelectric materials is presented. The reversible and irreversible contributions of polarization are separated. The measurements of these effects are performed simultaneously giv ...

2002

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