Magnetization Effects in bulk YFeO3 and their dependency on electric field strength and temperature as a basis for thin film investigation of Multiferroic Technology

2011 ◽  
Vol 1292 ◽  
Author(s):  
A. Hinckley ◽  
R.K. Gupta ◽  
P.K. Kahol ◽  
K. Ghosh
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Rare Earth ◽  
Field Strength ◽  
Electric Field ◽  
Electric Field Strength ◽  
Bulk Material ◽  
Ferromagnetic Behavior ◽  
Ample Evidence ◽  
Saturation Magnetic Moment

ABSTRACTMultiferroics, the study of materials which possess ferromagnetic and ferroelectric ordering in a single phase, has become an area of prominent research. Moreover, this behavior has been extensively studied in materials which possess a perovskite crystal structure such as BiFeO3 and YMnO3. Due to their weak saturation magnetic moment, many rare-earth orthoferrites are currently of extreme interest. Utilizing a solid-state reaction between Y2O3 and Fe2O3 we have developed the rare-earth orthoferrite YFeO3 and conducted a bulk material study to determine this material’s availability for thin film multiferroic research. The absence of Y2O3 and Fe2O3 impurities was confirmed using Copper-Kα XRD. Examination of the dependence of the magnetization M on the temperature T was conducted to determine the reliability of multiferroic behavior across varying temperatures in conjunction with the investigation of the dependence of M on the electric field strength H. Results clearly display ferromagnetic behavior in our bulk material, providing ample evidence that our bulk material is an excellent candidate for thin film studies. Future studies on multiferroic YFeO3 thin films grown via pulsed laser deposition on Lanthanum Aluminate substrates will be conducted. Detailed data will be provided via XRD and SQUID to confirm magnetic properties while impurities are non-existent in our thin films.

Electrostatically controlled large-amplitude, non-axisymmetric waves in thin film flows down a cylinder

2013 ◽  
Vol 736 ◽  
Author(s):  
A. W. Wray ◽  
D. T. Papageorgiou ◽  
O. K. Matar
Keyword(s):  
Thin Film ◽  
Field Strength ◽  
Electric Field ◽  
Evolution Equation ◽  
Electric Field Strength ◽  
Numerical Solutions ◽  
Outer Cylinder ◽  
Outer Electrode ◽  
Two Dimensional ◽  
Film Flows

AbstractWe examine the dynamics of a thin film flowing under gravity down the exterior of a vertically aligned inner cylinder, with a co-aligned, concentric cylinder acting as an outer electrode; the space between the outer cylinder and the film is occupied by an inviscid gas. The stability of the interface is studied when it is subjected to an electric field, applied by imposing a potential difference between the two cylinders. Leaky-dielectric theory is used in conjunction with asymptotic reduction, in the large-conductivity limit, to derive a single, two-dimensional evolution equation for the interfacial location, which accounts for gravity, capillarity, and electrostatic effects. A linear stability analysis is carried out which shows that non-axisymmetric modes become more dominant with increasing electric field strength. Our fully two-dimensional numerical solutions of the evolution equation demonstrate qualitative agreement between the trends observed in the nonlinear regime and those predicted by linear theory. These numerical solutions also show that, depending on the electric field strength and the relative proximity of the outer electrode, the interface either remains spatially uniform, or exhibits either axisymmetric or, importantly, non-axisymmetric travelling waves. The effect of wave formation on the interfacial area is investigated in connection with the use of electric fields to control thin film flows to enhance heat and mass transfer rates.

scholarly journals Investigation of the dielectric fatigue on the example of lead titanate films PbTiO3

2021 ◽  
Vol 2086 (1) ◽  
pp. 012179
Author(s):  
A V Fimin ◽  
E A Pecherskaya ◽  
O A Timokhina ◽  
V S Aleksandrov ◽  
A V Volik ◽  
...  
Keyword(s):  
Thin Films ◽  
Field Strength ◽  
Electric Field ◽  
Electric Field Strength ◽  
Lead Titanate ◽  
Piecewise Linear ◽  
Hysteresis Loops ◽  
Ferroelectric Materials ◽  
Piecewise Linear Approximation ◽  
Residual Polarization

Abstract The phenomenon of dielectric fatigue of active dielectrics, which consists in a decrease in the residual polarization depending on the number of switching cycles, is researched. A model of the dependence of the residual polarization of ferroelectric materials on the number of switching cycles is proposed. The model is based on piecewise - linear approximation of the results of measurements of the hysteresis loops of thin films PbTiO3 at a temperature T = 470 (°C), the electric field strength E = 100 (kV/cm). The developed model was used in the development of a technique for studying dielectric fatigue, depending on different modes of material switching.

scholarly journals Non-Equilibrium Ionization Growth In Molecular Hydrogen

1966 ◽  
Vol 19 (6) ◽  
pp. 795 ◽  
Keyword(s):  
Thin Film ◽  
Field Strength ◽  
Electric Field ◽  
Electric Field Strength ◽  
Molecular Hydrogen ◽  
Gas Pressure ◽  
Spatial Growth ◽  
Non Equilibrium

A thin-film cathode is used in an examination of the spatial growth of ionization in molecular hydrogen at high values of the parameter E/p (E is the electric field strength in V/cm; p is the gas pressure in torr at 0�C). Particular attention is given to

scholarly journals Microwave magnetoelectric effect in structures based on ferromagnetic metals

2019 ◽  
Vol 30 ◽  
pp. 07013
Author(s):  
Alexander Tatarenko ◽  
Oleg Sokolov ◽  
Sergey Ivanov ◽  
Mirza Bichurin ◽  
Yaojin Wang
Keyword(s):  
Thin Films ◽  
Field Strength ◽  
Electric Field ◽  
Theoretical Calculation ◽  
Electric Field Strength ◽  
Magnetoelectric Effect ◽  
Nickel Iron ◽  
Magnetoelectric Composites ◽  
Ferromagnetic Metals ◽  
Magnetizing Field

The results of a theoretical calculation of the resonant magnetizing field values for ferromagnetic resonance in thin films of nickel, iron and cobalt for frequencies of 3, 10, 30 GHz for various orientations of this field are presented. Analytical dependences of the ferromagnetic line shifts on the electric field strength are obtained for two- layer magnetoelectric composites in which PZT, PMN-PT or PZN-PT disks are used as piezoelectrics on which thin films of Ni, Fe or Co are deposited.

Optical Measurement of the Electric Field Strength in a Gel Insulator

2016 ◽  
Vol 136 (10) ◽  
pp. 1420-1421
Author(s):  
Yusuke Tanaka ◽  
Yuji Nagaoka ◽  
Hyeon-Gu Jeon ◽  
Masaharu Fujii ◽  
Haruo Ihori
Keyword(s):  
Field Strength ◽  
Electric Field ◽  
Electric Field Strength ◽  
Optical Measurement

Effect of external magnetic field on lane formation in driven pair-ion plasmas

2021 ◽  
Vol 87 (2) ◽  
Author(s):  
Swati Baruah ◽  
U. Sarma ◽  
R. Ganesh
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Field Strength ◽  
Electric Field ◽  
Electric Field Strength ◽  
Coupling Parameter ◽  
Critical Parameters ◽  
Coulomb Coupling ◽  
Lane Formation ◽  
Parameter Values

Lane formation dynamics in externally driven pair-ion plasma (PIP) particles is studied in the presence of external magnetic field using Langevin dynamics (LD) simulation. The phase diagram obtained distinguishing the no-lane and lane states is systematically determined from a study of various Coulomb coupling parameter values. A peculiar lane formation-disintegration parameter space is identified; lane formation area extended to a wide range of Coulomb coupling parameter values is observed before disappearing to a mixed phase. The different phases are identified by calculating the order parameter. This and the critical parameters are calculated directly from LD simulation. The critical electric field strength value above which the lanes are formed distinctly is obtained, and it is observed that in the presence of the external magnetic field, the PIP system requires a higher value of the electric field strength to enter into the lane formation state than that in the absence of the magnetic field. We further find out the critical value of electric field frequency beyond which the system exhibits a transition back to the disordered state and this critical frequency is found as an increasing function of the electric field strength in the presence of an external magnetic field. The movement of the lanes is also observed in a direction perpendicular to that of the applied electric and magnetic field directions, which reveals the existence of the electric field drift in the system under study. We also use an oblique force field as the external driving force, both in the presence and absence of the external magnetic field. The application of this oblique force changes the orientation of the lane structures for different applied oblique angle values.

scholarly journals High Pressure X-ray Diffraction as a Tool for Designing Doped Ceria Thin Films Electrolytes

Coatings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 724
Author(s):  
Sara Massardo ◽  
Alessandro Cingolani ◽  
Cristina Artini
Keyword(s):  
Thin Films ◽  
High Pressure ◽  
Rare Earth ◽  
Ionic Conductivity ◽  
Bulk Material ◽  
Threshold Temperature ◽  
Doped Ceria ◽  
X Ray Diffraction ◽  
X Ray ◽  
Rare Earth Doped

Rare earth-doped ceria thin films are currently thoroughly studied to be used in miniaturized solid oxide cells, memristive devices and gas sensors. The employment in such different application fields derives from the most remarkable property of this material, namely ionic conductivity, occurring through the mobility of oxygen ions above a certain threshold temperature. This feature is in turn limited by the association of defects, which hinders the movement of ions through the lattice. In addition to these issues, ionic conductivity in thin films is dominated by the presence of the film/substrate interface, where a strain can arise as a consequence of lattice mismatch. A tensile strain, in particular, when not released through the occurrence of dislocations, enhances ionic conduction through the reduction of activation energy. Within this complex framework, high pressure X-ray diffraction investigations performed on the bulk material are of great help in estimating the bulk modulus of the material, and hence its compressibility, namely its tolerance toward the application of a compressive/tensile stress. In this review, an overview is given about the correlation between structure and transport properties in rare earth-doped ceria films, and the role of high pressure X-ray diffraction studies in the selection of the most proper compositions for the design of thin films.

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