1996/07/24 by Ar. Abanov, A. Kashuba, А. Кашуба +1
Physics and Astronomy · #Magnetic properties of thin films #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #cond-mat
paper · pdf · doi:10.1103/physrevb.56.3181
34 pages, RevTeX, 2 .ps figures, the third figure is available upon request
arxiv created 1996/07/24 · openalex publication_date 1997/08/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
In a two-dimensional XY ferromagnet the dipole force induces a strong interaction between spin waves in the long-wavelength limit. The major effect of this interaction is the transformation of a propagating spin wave into a diffusion mode. We study the anomalous dynamics of such diffusion modes. We find that the Janssen--De Dominics functional, which governs this dynamics, approaches the non-Gaussian fixed point. A spin wave propagates by an anomalous anisotropic diffusion with the dispersion relation: i\ensuremathω\ensuremath∼ky^\ensuremathΔy and i\ensuremathω\ensuremath∼kx^\ensuremathΔx, where \ensuremathΔy=47/27 and \ensuremathΔx=47/36. The low-frequency response to the external magnetic field is found.