نتایج جستجو برای: ferroelectricity
تعداد نتایج: 1253 فیلتر نتایج به سال:
In 1600, William Gilbert of Colchester published the standard treatise on the difference between magnetism and electricity. He died a few years later, and his analysis was the canon of European thinking on the subject for 300 years. In 1894, Pierre Curie suggested that electricity and magnetism might be coupled in materials, but theoretical and experimental validation only came at the end of th...
Multiferroics, materials where spontaneous long-range magnetic and dipolar orders coexist, represent an attractive class of compounds, which combine rich and fascinating fundamental physics with a technologically appealing potential for applications in the general area of spintronics. Ab-initio calculations have significantly contributed to recent progress in this area, by elucidating different...
Effects of ferroelectricity and magnetism on electron and spin transport in Fe/BaTiO 3 /Fe multiferroic tunnel junctions" (2008). Faculty Publications from Nebraska Center for Materials and Nanoscience. Paper 74.
In 1865, James Clerk Maxwell proposed four equations governing the dynamics of electric fi elds, magnetic fi elds and electric charges, which are now known as Maxwell’s equations1. Th ey show that magnetic interactions and motion of electric charges, which were initially thought to be two independent phenomena, are intrinsically coupled to each other. In the covariant relativistic form, they re...
COMPARISON OF THE ELECTRONIC STRUCTURES AND ENERGETICS OF FERROELECTRIC LiNbO3 and LiTaO3 IRIS INBAR
Extensive LAPW frozen phonon calculations were performed in order to understand the origin of ferroelectricity in LiTaO3 and LiNbO3. Displacement of the Li atoms alone results in an anharmonic single well, whereas displacements of oxygen and lithium together result in deep double wells, much deeper than the transition temperatures, TC . This is contrary to current theories which model the under...
The liquid crystals (LC), due to their naturally high bulk ordering, strong birefringence and easy electrooptical driving, serve as matrix in the nanocomposites doped with non-mesogenic or mesogenic nanoparticles. The nanocomposite’s structural units exhibit very complex molecular form indicating the strength and the intermolecular interaction between the matrix and dopant’s molecules. Hydrogen...
In electronic-type ferroelectrics, where dipole moments produced by the variations of electron configurations are aligned, the polarization is expected to be rapidly controlled by electric fields. Such a feature can be used for high-speed electric-switching and memory devices. Electronic-type ferroelectrics include charge degrees of freedom, so that they are sometimes conductive, complicating d...
Heterostructured material systems devoid of ferroic components are presumed not to display ordering associated with ferroelectricity. In heterostructures composed of transition metal oxides, however, the disruption introduced by an interface can affect the balance of the competing interactions among electronic spins, charges and orbitals. This has led to the emergence of properties absent in th...
Emerging Applications of Ferroelectric Nanoparticles in Materials Technologies, Biology and Medicine
Consider an insulating system with non-zero spontaneous polarization Ps (dielectric di‐ pole moment per unit volume). If an applied external electric field E that is greater than the so-called coercive field Ec can reverse Ps then our system is a ferroelectric system. Ferroelectricity has a long and exciting history described in [1,2]. In the beginning of its historical development (the Rochell...
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