LIMM: A technique for determination of the spatial distribution of the spontaneous polarization in ferroelectric thin films

1999 ◽  
Vol 27 (1-4) ◽  
pp. 119-126 ◽  
Author(s):  
Sidney B. Lang
Keyword(s):  
Thin Films ◽  
Spatial Distribution ◽  
Spontaneous Polarization ◽  
Ferroelectric Thin Films

Quantitative investigation of polarization-dependent photocurrent in ferroelectric thin films

2021 ◽  
Author(s):  
Komalika Rani ◽  
Sylvia Matzen ◽  
Stéphane Gable ◽  
Thomas Maroutian ◽  
Guillaume Agnus ◽  
...  
Keyword(s):  
Thin Films ◽  
Photovoltaic Effect ◽  
Quantitative Relationship ◽  
Open Circuit ◽  
Ferroelectric Thin Films ◽  
Ferroelectric Polarization ◽  
Ferroelectric Layer ◽  
Ferroelectric Memories ◽  
Careful Investigation

Abstract Ferroelectric thin films are investigated for their potential in photovoltaic (PV) applications, owing to their high open-circuit voltage and switchable photovoltaic effect. The direction of the ferroelectric polarization can control the sign of the photocurrent through the ferroelectric layer, theoretically allowing for 100 percent switchability of the photocurrent with the polarization, which is particularly interesting for photo-ferroelectric memories. However, the quantitative relationship between photocurrent and polarization remains little studied. In this work, a careful investigation of the polarization-dependent photocurrent of epitaxial Pb(Zr,Ti)O3 thin films has been carried out, and has provided a quantitative determination of the unswitchable part of ferroelectric polarization. These results represent a systematic approach to study and optimize the switchability of photocurrent, and more broadly to get important insights on the ferroelectric behavior in all types of ferroelectric layers in which pinned polarization is difficult to investigate.

DETERMINATION OF THE EQUIVALENT ANISOTROPY PROPERTIES OF POLYCRYSTALLINE MAGNETIC MATERIALS: THEORETICAL ASPECTS AND NUMERICAL ANALYSIS

2013 ◽  
Vol 23 (07) ◽  
pp. 1217-1233 ◽  
Author(s):  
ORIANO BOTTAUSCIO ◽  
VALERIA CHIADÒ PIAT ◽  
MICHELA ELEUTERI ◽  
LUCA LUSSARDI ◽  
ALESSANDRA MANZIN
Keyword(s):  
Thin Films ◽  
Spatial Distribution ◽  
Numerical Analysis ◽  
Magnetic Materials ◽  
Hysteresis Loops ◽  
Magnetic Thin Films ◽  
Energy Functional ◽  
Γ Convergence ◽  
Anisotropic Contribution

The aim of this paper is the determination of the equivalent anisotropy properties of polycrystalline magnetic materials, modeled as an assembly of monocrystalline grains with a stochastic spatial distribution of easy axes. The theory of Γ-convergence is here adopted to homogenize the anisotropic contribution in the energy functional and derive the equivalent anisotropy properties. The reliability of this approach is investigated focusing on the computation of the static hysteresis loops of polycrystalline magnetic thin films, starting from the numerical integration of the Landau–Lifshitz–Gilbert equation.

In-Situ Control of the Direction of Spontaneous Polarization in Ferroelectric thin Films by RF-Magnetron Sputtering

1996 ◽  
Vol 459 ◽  
Author(s):  
K. Iijima ◽  
K. Niihara
Keyword(s):  
Thin Films ◽  
Magnetron Sputtering ◽  
Spontaneous Polarization ◽  
Rf Magnetron Sputtering ◽  
Ferroelectric Thin Films ◽  
The Other ◽  
Second Step ◽  
Step Method ◽  
In Situ Control

ABSTRACTLa-modified PbTiO3thin films were grown on (100)MgO by rf-magnetron sputtering. Thin films were prepared by “two step method” in which the different Pb/Ti ratios during the growth were used for the first step (0–4nm of thickness) and the subsequent second step (>4nm). The Pb/Ti ratios of the first step were selected from 1.2 to 1.5. The Pb/Ti ratio of the second step, on the other hand, was fixed at 1.4. Strong dependency of the direction of the spontaneous polarization (Ps) to the Pb/Ti ratio of the first step was observed. It is concluded that the direction of the Ps in the films is determined by the atomic species of the first layer of the films.

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