  A new type of three-dimensional magnetic soliton in easy-axis ferromagnets is
predicted by taking simultaneous account of the Dzyaloshinsky-Moriya
interaction and an external magnetic field. The numerically obtained static
three-dimensional solitons with a finite energy are characterized by a Hopf
topological index H=0 and have a vortex structure. The structure of these
solitons and the dependence of their energy on the external field are
determined. The asymptotic behavior of these solitons is investigated and a
necessary condition for their existence is found.
