Bound states of large number of magnons in a three-dimensional ferromagnet (magnons drops)
Ivanov B.A., Kosevich A.M.
We consider the bound states of N magnons in a ferromagnet with easy-axis anisotropy, assuming that the energy of the magnetic anisotropy is small in comparison with the volume energy. It is shown that there always exist bound states with N>N,>1, where JV. is determined by the ratio of the exchange constant to the anisotropy constant. The investigated states can be treated as "magnon drops."
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![](/ps/1816/article_27757_800_head.png "We consider the bound states of <i>N </i>magnons in a ferromagnet with easy-axis anisotropy, assuming that the energy of the magnetic anisotropy is small in comparison with the volume energy. It is shown that there always exist bound states with <i>N>N,>1, </i>where JV. is determined by the ratio of the exchange constant to the anisotropy constant. The investigated states can be treated as "magnon drops."")