Holographic realization of ferromagnets

Dirac electrons and domain walls: A realization in junctions of ferromagnets and topological insulators

Holographic realization of hexagonal two dimensional photonic crystal structures with elliptical geometry

A complete investigation of holographic photonic crystal structures has been conducted. From both theoretical and experimental results, profiles of resultant patterns under different process conditions can be estimated and controlled. The use of antireflection layers is crucial for realizing submicron photonic crystals with good uniformity over a large area. We successfully realize submicron-sc...

Critical Dynamics of Ferromagnets

The crossover in the dynamics from isotropic to dipolar critical behaviour has been a matter of debate over many years. We review a mode coupling theory for dipolar ferromagnets which gives a unified explanation of the seemingly contradictory experimental situation. The shape functions, the scaling functions for the damping coefficients and the precise position of the crossover are computed. Be...

Hysteresis in Ferromagnets

We study the scaling of the area of hysteresis loops in ferromagnetic N-vector models with short-ranged spin-isotropic interactions, as a function of the amplitude and frequency of the external magnetic eld.

Vortex rings in ferromagnets

Vortex ring solutions are presented for the Landau-Lifshitz equation, which models the dynamics of a three-dimensional ferromagnet. The vortex rings propagate at constant speed along their symmetry axis and are characterized by the integer-valued Hopf charge. They are stable to axial perturbations, but it is demonstrated that an easy axis anisotropy results in an instability to perturbations wh...