Electronics

  2010 SEP 1 - (VerticalNews.com) -- According to recent research from Poznan, Poland, "This work presents an investigation of the collapse effect predicted to occur in the spin-waveband structure of magnetic cubic thin films."

  "The system under consideration is described by the Heisenberg model with exchange interactions between the nearest (NN) and next-nearest neighbors (NNN) taken into account. In the collapse effect, which occurs for some specific directions of in-plane propagation of spin waves, the effective coupling between spins in adjacent layers vanishes dynamically and each mode becomes confined to a single atomic plane; this means that all the bulk modes and, independently, all the surface modes become energetically degenerate," wrote S. Mamica and colleagues, Adam Mickiewicz University ...read more

  2010 SEP 1 - (VerticalNews.com) -- "The implicit boundary finite-element method avoids the need for generating conforming mesh by using structured mesh for the analysis. A structured mesh (also referred to here as a grid) is a nonconforming mesh that is made up of regular shaped elements (rectangles for 2-D or cuboids for 3-D) and is easier to generate than traditional finite-element mesh," scientists in the United States report.

  "The geometry of the analysis domain is represented using equations that are independent of the grid. Essential boundary conditions are applied using solution structures that are constructed using approximate step functions of the boundary such that these boundary conditions are guaranteed to be enforced. A variety of interpolation functions and approximations such as B-splines can be used with this approach," wrote S.U. Zhang and colleagues, University of Florida ...read more

  2010 SEP 1 - (VerticalNews.com) -- "Ab-initio calculations are performed to investigate the structural, electronic and magnetic properties of spin-polarized diluted magnetic semiconductors composed of II-VI compounds Cd1-xCoxX (X = S, Se, Te) at x = 0.25. From the calculated results of band structure and density of states, the half-metallic character and stability of ferromagnetic state for Cd1-xCoxS, Cd1-xCoxSe and Cd1-xCoxTe alloys are determined," scientists in Sargodha, Pakistan report ...read more