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In this paper we report on the observation of very high and narrowmagnetoconductance peaks which we attribute to the transition to quantum Hallferromagnet (QHFM) state occurring at the edges of the sample. We show that theexpected spatial degeneracy of chiral edge channels is spontaneously lifted inagreement with theoretical studies performed within the Hartree-Fockapproximation. We indicate also that separated edge currents which flow inparallel, may nevertheless cross at certain points, giving rise to theformation of topological defects or one-dimensional magnetic domains.Furthermore, we find that such local crossing of chiral channels can be inducedon demand by coupling spin states of a Landau level to different currentterminals and applying a DC source-drain voltage.

Conductance resonances and crossing of the edge channels in the quantum Hall ferromagnet state of Cd(Mn)Te microstructures