  In this paper we report on the observation of very high and narrow
magnetoconductance peaks which we attribute to the transition to quantum Hall
ferromagnet (QHFM) state occurring at the edges of the sample. We show that the
expected spatial degeneracy of chiral edge channels is spontaneously lifted in
agreement with theoretical studies performed within the Hartree-Fock
approximation. We indicate also that separated edge currents which flow in
parallel, may nevertheless cross at certain points, giving rise to the
formation of topological defects or one-dimensional magnetic domains.
Furthermore, we find that such local crossing of chiral channels can be induced
on demand by coupling spin states of a Landau level to different current
terminals and applying a DC source-drain voltage.
