Spontaneous magnon decays in planar ferromagnet

Stephanovich, V. A.; Zhitomirsky, M. E.

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Spontaneous magnon decays in planar ferromagnet

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Zhitomirsky, M. E.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Stephanovich, V. A., & Zhitomirsky, M. E. (2011). Spontaneous magnon decays in planar ferromagnet. EPL, 95(1 Sp. Iss. SI): 17007.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0029-8C89-3

Abstract

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* approximate to 1/7. We also discuss the possibility of experimental observation of the predicted effect in a number of ferromagnetic insulators. Copyright (C) EPLA, 2011