Comments on nonlinear excitations in the anisotropic Heisenberg chain

Abstract

It is suggested that pulse soliton solutions for the classical, continuum, isotropic, ferromagnetic Heisenberg chain in a magnetic field continuously deform to sine Gordon breather solutions as anisotropy is increased to an extremeXY limit (theXY plane containing the applied field). The relevance of this observation for applications to magnetic chains such as CsNiF3 is emphasized, and comparisons with the zero-field limit are noted.