Topological Characterization of Classical Waves: The Topological Origin of Magnetostatic Surface Spin Waves

Magnetostatic Spin Waves

i.e., that the free currents flow in closed loops. Likewise, the time derivative of the fourth Maxwell equation implies that Jfree has no time dependence in magnetostatics. Often, magnetostatics is taken to be the situation in which ∇ · Jfree = 0 and D, E and Jfree have no time dependence, without explicit assumption that B and H also have no time dependence. Discuss the possibility of waves of...

Topological defects in Spin Density Waves

The rich order parameter of Spin Density Waves allows for an unusual object of a complex topological nature: a half-integer dislocation combined with a semi-vortex of the staggered magnetization. It becomes energetically preferable to ordinary dislocation due to enhanced Coulomb interactions in the semiconducting regime. Generation of these objects changes e.g. the narrow band noise frequency. ...

Spectrum and Attenuation of Non-Linear Surface Magnetostatic Spin Waves in Ferrite Films

Dispersion and attenuation of non-linear surface magnetostatic waves (MSSW) propagating in thin ythium-irongarnet (YIG) fenite Nms have been studied both experimentally and theoretically. They were defined from the amplitude and phase alterations of the wave as it traveled along the "non-equilibrium" part of the film. At the border of such a non-equilibrium part the wave power is equal to the t...

Snowflake Topological Insulator for Sound Waves

Magnetostatic surface waves propagation at dissipative ferrite-MTMs-metal structure

The magnetostatic surface waves (MSSW) propagation in a layered structure composed of ferrite film covered by air and on top of metamaterial (MTM) placed on metal is discussed. Dispersion equations which relate the parameters of different layers are derived and used to analyse propagation of MSSW. It is found that the MSSW excitation band depends on the thickness of the MTM layer and ferrite la...