J. Wolfman
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View article: History-dependent and frequency-dependent dielectric nonlinearities induced by polar nanoregions in a thin film of 0.5 ( Ba 0.7 Ca 0.3 TiO 3 ) -- 0.5 ( BaZr 0.2 Ti 0.8 O 3 )
History-dependent and frequency-dependent dielectric nonlinearities induced by polar nanoregions in a thin film of 0.5 ( Ba 0.7 Ca 0.3 TiO 3 ) -- 0.5 ( BaZr 0.2 Ti 0.8 O 3 ) Open
In this article, dielectric nonlinearities in 0.5(Ba0.7 Ca0.3 TiO3 ) -- 0.5(BaZr 0.2 Ti0.8 O3 ) thin film are studied using impedance spectroscopy and harmonic measurements, as a function of the AC measuring field, at different frequencies…
View article: Compositionally graded Ba1−<i>x</i>Sr<i>x</i>TiO3 thin film for SIMS applications
Compositionally graded Ba1−<i>x</i>Sr<i>x</i>TiO3 thin film for SIMS applications Open
A heterostructure of Ba1−xSrxTiO3/La1.1Sr0.9NiO3/SrTiO3 has been analyzed by magnetic sector secondary ion mass spectrometry (SIMS). The stoichiometry parameter x of the top layer was made varying continuously from 0 to 1 along the width o…
View article: Evidence of the matrix effect on a compositionally graded oxide thin film
Evidence of the matrix effect on a compositionally graded oxide thin film Open
A heterostructure of Ba$_{1-x}$Sr$_x$TiO$_3$/La$_{1.1}$Sr$_{0.9}$NiO$_3$ /SrTiO$_3$ has been analysed by magnetic sector secondary ion mass spectrometry (SIMS). The stoichiometry parameter $x$ of the top layer was made varying continuously…
View article: SIMS analysis of an oxide thin film with continuous composition gradient
SIMS analysis of an oxide thin film with continuous composition gradient Open
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View article: Enhancement of piezoelectric properties in a narrow cerium doping range of $\text{Ba}_{1-x}\text{Ca}_{x}\text{Ti}_{1-y}\text{Zr}_{y}\text{O}_{3}$ evidenced by high throughput experiment
Enhancement of piezoelectric properties in a narrow cerium doping range of $\text{Ba}_{1-x}\text{Ca}_{x}\text{Ti}_{1-y}\text{Zr}_{y}\text{O}_{3}$ evidenced by high throughput experiment Open
Lead-free materials based on the $\text{(Ba,Ca)(Zr,Ti)O}_{3}$ (BCZT) system exhibit excellent electromechanical properties that can be strongly modified by small amounts of dopants. Here, we use a high throughput strategy to unravel the in…
View article: Subcoercive field dielectric response of 0.5(Ba0.7Ca0.3TiO3)-0.5(BaZr0.2Ti0.8O3) thin film: Peculiar third harmonic signature of phase transitions and residual ferroelectricity
Subcoercive field dielectric response of 0.5(Ba0.7Ca0.3TiO3)-0.5(BaZr0.2Ti0.8O3) thin film: Peculiar third harmonic signature of phase transitions and residual ferroelectricity Open
Subcoercive field non-linearities in 0.5(Ba0.7Ca0.3TiO3)-0.5(BaZr0.2Ti0.8O3) (BCTZ 50/50) thin film elaborated using pulsed laser deposition are studied using permittivity and phase angle of the third harmonic measurements as a function of…
View article: Subcoercive-field dielectric response of $0.5(\text{Ba}_{0.7}\text{Ca}_{0.3}\text{TiO}_{3})-0.5(\text{BaZr}_{0.2}\text{Ti}_{0.8}\text{O}_{3})$ thin film: peculiar third harmonic signature of phase transitions and residual ferroelectricity
Subcoercive-field dielectric response of $0.5(\text{Ba}_{0.7}\text{Ca}_{0.3}\text{TiO}_{3})-0.5(\text{BaZr}_{0.2}\text{Ti}_{0.8}\text{O}_{3})$ thin film: peculiar third harmonic signature of phase transitions and residual ferroelectricity Open
Sub-coercive field non-linearities in $0.5(\text{Ba}_{0.7}\text{Ca}_{0.3}\text{TiO}_{3})-0.5(\text{BaZr}_{0.2}\text{Ti}_{0.8}\text{O}_{3})$ (BCTZ 50/50) thin film elaborated using pulsed laser deposition are studied using permittivity and …
View article: Evidence of Ba-rich surface segregation in Ba<sub>1-x</sub>Sr<sub>x</sub>TiO<sub>3</sub> and Ba-rich surfactant in SrTiO<sub>3</sub>/ Ba<sub>1-x</sub>Sr<sub>x</sub>TiO<sub>3</sub> stacks grown by combinatorial pulsed laser deposition
Evidence of Ba-rich surface segregation in Ba<sub>1-x</sub>Sr<sub>x</sub>TiO<sub>3</sub> and Ba-rich surfactant in SrTiO<sub>3</sub>/ Ba<sub>1-x</sub>Sr<sub>x</sub>TiO<sub>3</sub> stacks grown by combinatorial pulsed laser deposition Open
The interface of a La 0.7 Sr 0.3 MnO 3 /SrTiO 3 bilayer was modulated by introducing 3 unit cells of Ba 1-x Sr x TiO 3 using Combinatorial Pulsed Laser Deposition. A wide range of chemical compositions was studied within the same sample, w…
View article: Evaluation of Optical and Acoustical Properties of Ba1−xSrxTiO3 Thin Film Material Library via Conjugation of Picosecond Laser Ultrasonics with X-ray Diffraction, Energy Dispersive Spectroscopy, Electron Probe Micro Analysis, Scanning Electron and Atomic Force Microscopies
Evaluation of Optical and Acoustical Properties of Ba1−xSrxTiO3 Thin Film Material Library via Conjugation of Picosecond Laser Ultrasonics with X-ray Diffraction, Energy Dispersive Spectroscopy, Electron Probe Micro Analysis, Scanning Electron and Atomic Force Microscopies Open
Wide-range continuous spatial variation of the film composition in lateral compositionally graded epitaxial films requires the development of high throughput measurement techniques for their local and non-destructive characterization with …
View article: Tunability Investigation in the BaTiO3-CaTiO3-BaZrO3 Phase Diagram Using a Refined Combinatorial Thin Film Approach
Tunability Investigation in the BaTiO3-CaTiO3-BaZrO3 Phase Diagram Using a Refined Combinatorial Thin Film Approach Open
Tunable ferroelectric capacitors, which exhibit a decrease in the dielectric permittivity under an electric field, are widely used in electronics for RF tunable applications. Current devices use barium strontium titanate (BST) as the tunab…
View article: Interface Combinatorial Pulsed Laser Deposition to Enhance Heterostructures Functional Properties
Interface Combinatorial Pulsed Laser Deposition to Enhance Heterostructures Functional Properties Open
In this chapter we will describe a new development of combinatorial pulsed laser deposition (CPLD) which targets the exploration of interface libraries. The idea is to modulate continuously the composition of interfaces on a few atomic lay…
View article: Strain-induced resistance change in V2O3 films on piezoelectric ceramic disks
Strain-induced resistance change in V2O3 films on piezoelectric ceramic disks Open
We prepared a stacked structure consisting of a quasi-free-standing functional oxide thin film and a ceramic piezoelectric disk and observed the effect of the piezoelectric disk deformation on the resistance of the thin film. Epitaxial V2O…
View article: Metal-insulator transition in V2O3 thin film caused by tip-induced strain
Metal-insulator transition in V2O3 thin film caused by tip-induced strain Open
We have demonstrated pressure-induced transition in a c-axis oriented vanadium sesquioxide (V2O3) thin film from a strongly correlated metal to a Mott insulator in a submicrometric region by inducing a local stress using contact atomic for…
View article: Interlayer strain effects on the structural behavior of BiFeO3/LaFeO3 superlattices
Interlayer strain effects on the structural behavior of BiFeO3/LaFeO3 superlattices Open
Artificial (BiFeO3)0.5Λ/(LaFeO3)0.5Λ superlattices have been grown by pulsed laser deposition. The periodicity Λ was varied from 150 Å to 25 Å and the relative ratio between BiFeO3 (BFO) and LaFeO3 (LFO) is kept constant in each period. X-…
View article: Modelling and experimental measurements of the mechanical response of piezoelectric structures from millimetre to micrometre
Modelling and experimental measurements of the mechanical response of piezoelectric structures from millimetre to micrometre Open
Laser interferometry techniques have shown their ability to assess the mechanical response of a piezoelectric thin film. To support these investigations, a numerical study based on the finite element method is carried out: three-dimensiona…
View article: Cyclable and non-volatile electric field control of magnetism in BiFeO3 based magnetoelectric heterostructures
Cyclable and non-volatile electric field control of magnetism in BiFeO3 based magnetoelectric heterostructures Open
Room temperature manipulation of the ferromagnetic state via an electric field is investigated in Ni/BiFe0.95Mn0.05O3 thin film heterostructures. A 600% increase in the magnetic coercive field of the Ni layer is observed at the initial DC …
View article: Cryogenic plasma-processed silicon microspikes as a high-performance anode material for lithium ion-batteries
Cryogenic plasma-processed silicon microspikes as a high-performance anode material for lithium ion-batteries Open
Micro- or nano-structuring is essential in order to use Si as an anode material for lithium ion batteries. In the present study, we attempted to use Si wafers with a spiky microstructure (SMS), the so-called black-Si, prepared by a cryogen…
View article: Nonlinear piezoelectric properties of epitaxial BaTiO<sub>3</sub>thin film
Nonlinear piezoelectric properties of epitaxial BaTiO<sub>3</sub>thin film Open
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View article: Multifunctional tunable and piezoelectric Ba1-xCaxTi1-yZryO3 thin film capacitors for energy efficiency and harvesting
Multifunctional tunable and piezoelectric Ba1-xCaxTi1-yZryO3 thin film capacitors for energy efficiency and harvesting Open
Multifunctional materials exhibiting both variable permittivity under electric field and large piezoelectric coefficients can be used in microelectronic applications for energy efficiency as an active impedance matching as well as for vibr…
View article: Phase Diagram of BiFeO<sub>3</sub>/LaFeO<sub>3</sub> Superlattices: Antiferroelectric‐Like State Stability Arising from Strain Effects and Symmetry Mismatch at Heterointerfaces
Phase Diagram of BiFeO<sub>3</sub>/LaFeO<sub>3</sub> Superlattices: Antiferroelectric‐Like State Stability Arising from Strain Effects and Symmetry Mismatch at Heterointerfaces Open
(BiFeO 3 ) (1− x )Λ /(LaFeO 3 ) x Λ superlattices (SLs) have been grown using pulsed laser deposition and studied by X‐ray diffraction, transmission electron microscopy (TEM), and Raman spectroscopy. The composition is varied, 0.30 ≤ x ≤ 0…
View article: Tunability, dielectric, and piezoelectric properties of Ba(1−<i>x</i>)Ca<i>x</i>Ti(1−<i>y</i>)Zr<i>y</i>O3 ferroelectric thin films
Tunability, dielectric, and piezoelectric properties of Ba(1−<i>x</i>)Ca<i>x</i>Ti(1−<i>y</i>)Zr<i>y</i>O3 ferroelectric thin films Open
Tunable ferroelectric capacitors, which exhibit a decrease of the dielectric permittivity (ϵ) under electric field, are widely used in electronics for RF tunable applications (e.g., antenna impedance matching). Current devices use barium s…
View article: Enhancement of piezoelectric response in Ga doped BiFeO3 epitaxial thin films
Enhancement of piezoelectric response in Ga doped BiFeO3 epitaxial thin films Open
The piezoelectric properties of compositional spread (1 − x)BiFeO3-xGaFeO3 epitaxial thin films are investigated where Ga3+ substitution for Bi3+ is attempted in Bi1−xGaxFeO3 compounds. Ga content x was varied from 0 to 12% (atomic). Ferro…