Spontaneous magnon decays in planar ferromagnet

Details Spontaneous magnon decays in planar ferromagnet Spontaneous magnon decays in planar ferromagnet

2011-05-10

arxiv.org/abs/1105.1893v1

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.

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