Domain wall in the quantum spin chain

The heavy spin complex localized near the end of the semiinfinite chain is investigated. The exchange anisotropy is taken into account. The reversed spin density at any value of the anisotropy constant is evaluated. It is shown that in the general case the expression of the spin density describs a domain wall. In the case of weak anisotropy when the continuum approximation is valid the result coincides with that known from the classical domain wall theory. Thus, the interpretation of the localized solutions of the classical equations as many particle bound states is confirmed