Spin Diffusion in 2D XY Ferromagnet with Dipolar Interaction

Abstract

In the ordered phase of 2D XY ferromagnet the dipolar interaction between spins induces a strong, relevant interaction between spin-waves. We study quasi-excitations of the interacting spin-wave 'liquid' in the long wavelength limit. We employ the Janssen-De-Dominicis method for classical Langevin equation to find the transformation of the spin-wave excitation into a new soft-mode excitation in the intermediate range of wavelengths; and into an anomalous anisotropic diffusion mode excitation at long wavelengths. The dissipation of a spin-wave at short wavelengths is found to be highly anisotropic.

10 pages LaTex paper and one PostScript figure

References in corpus (2)

• Singularities in the Fermi liquid description of a partially filled Landau level and the energy gaps of fractional quantum Hall states
• Critical Dynamics of Magnets

Cited by in corpus (4)

• Spin-wave interaction in two-dimensional ferromagnets with dipolar forces
• Long Wavelength Anomalous Diffusion Mode in the 2D XY Dipole Magnet
• Smecticlike phase for modulated XY spins in two dimensions
• A hierarchy of self-consistent stochastic boundary conditions for Ising lattice simulations