Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-05-10
Europhysics Letters, 95 (2011) 17007
Physics
Condensed Matter
Strongly Correlated Electrons
6 pages, 6 figures, to appear in Europhysics Letters
Scientific paper
10.1209/0295-5075/95/17007
We predict that spin-waves in an easy-plane ferromagnet have a finite lifetime at zero temperature due to spontaneous decays. In zero field the damping is determined by three-magnon decay processes, whereas decays in the two-particle channel dominate in a transverse magnetic field. Explicit calculations of the magnon damping are performed in the framework of the spin-wave theory for the $XXZ$ square-lattice ferromagnet with an anisotropy parameter $\lambda<1$. In zero magnetic field the decays occur for $\lambda^*<\lambda<1$ with $\lambda^*\approx 1/7$. We also discuss possibility of experimental observation of the predicted effect in a number of ferromagnetic insulators.
Stephanovich V. A.
Zhitomirsky Michael E.
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