Spin Diffusion in 2D XY Ferromagnet with Dipolar Interaction

Details Spin Diffusion in 2D XY Ferromagnet with Dipolar Interaction Spin Diffusion in 2D XY Ferromagnet with Dipolar Interaction

1996-03-26

arxiv.org/abs/cond-mat/9603160v1

Physics

Condensed Matter

10 pages LaTex paper and one PostScript figure

Scientific paper

10.1103/PhysRevLett.77.2554

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.

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