科研之友
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摘要
The origin of the central peak in the neutron scattering function, C((q) over right arrow,omega), for the classical two-dimensional anisotropic Heisenberg model has been a puzzle for several years. In this work we show that the central peak in the two-dimensional anisotropic Heisenberg model can be explained by a vortex-antivortex number fluctuation due to local diffusion and creation-annihilation processes. This behavior was seen more recently in the dynamics of vortices in magnetic nano-dots. The phenomenology we propose gives the correct behavior for the central peak found in the correlation function C((q) over right arrow,omega) when compared with experimental as well as numerical spin dynamics results.
- 出版日期2012-7
