119 research outputs found
Electric field effect on spin waves: Role of magnetic moment current
No full textWe show that a static electric field Ex gives rise to a shift of the spin wave dispersion relation in the direction of the wave number qy of the quantity . This effect is caused by the magnetic moment current carried by the spin wave itself which generates an additional phase proportional to the electric field, as in the Aharonov-Casher effect. This effect is independent of the possibly present magneto-electric effects of insulating ferromagnets and superimposes to them
THERMAL FLUCTUATIONS IN MAGNETIZED PARTICLES USING PATH INTEGRALS, FOKKER PLANCK EQUATION AND COHOMOLOGICAL TECHNIQUES
No full text
Disentangling electric field effect on spin waves in ferromagnetic insulators
No full textIn this paper we extend the micromagnetic theory of magnetostatic surface waves in insulating ferromagnetic thin films to include the applied electric field effects. We start by identifying the two main effects on the dispersion relation: the first one is of relativistic nature and emerges as a consequence of the Aharonov–Casher effect, while the second one is a consequence of the electric field induced symmetry breaking operating at the level of magnetic exchange interactions. We support our theory by comparing its predictions with experimental data on ittrium iron garnet thin films taken from the literature. The main result is to evidence the limitations
of using the same value of the applied electric field to address both effects and to emphasize that crystal symmetry breaking due to the applied electric field brings about the contributions of the crystal field and determines different amplitudes for the two effects
Magnetization instabilities due to spin Hall effect described by a nonequilibrium thermodynamic approach
No full textNumerical modeling of biomolecular electrostatic properties by the Element-Free Galerkin Method
No full textBoundary Element Analysis of the Electrostatic Interactions between Organic Scaffolds and Transmembrane Proteins
No full textDriven diffusion against electrostatic or effective energy barrier across α-hemolysin
No full textWe analyze the translocation of a charged particle across an α-Hemolysin (αHL) pore in the framework of a driven diffusion over an extended energy barrier generated by the electrical charges of the αHL. A one-dimensional electrostatic potential is extracted from the full 3D solution of the Poisson's equation. We characterize the particle transport under the action of a constant forcing by studying the statistics of the translocation time. We derive an analytical expression of translocation time average that compares well with the results from Brownian dynamic simulations of driven particles over the electrostatic potential. Moreover, we show that the translocation time distributions can be perfectly described by a simple theory which replaces the true barrier by an equivalent structureless square barrier. Remarkably, our approach maintains its accuracy also for low-applied voltage regimes where the usual inverse-Gaussian approximation fails. Finally, we discuss how the comparison between the simulated time distributions and their theoretical prediction results to be greatly simplified when using the notion of the empirical Laplace transform technique
- …
