Abstract
Real time domain wall (DW) propagation processes were observed using the magneto-optic indicator film technique (MOIF) in both single crystal and polycrystalline epitaxial exchange-coupled ferromagnet/antiferromagnet (FM/AFM) bilayers. In both cases a new phenomenon of preferable directions of a DW's expansion under a canted magnetic field was found. Upon application of a magnetic field oriented slightly (4°÷10°) off the unidirectional anisotropy axis clockwise or counterclockwise, unlike along this axis, during remagnetization from the ground state the domain growth occurred in that same direction at an angle of (14°÷45°). During remagnetization to the ground state upon field reduction, but no inversion, the preferred domain growth direction was at the angle with reversed sign, however in case the field reduction to zero or inversion, the preferred DW growth direction disappeared or was at the original angle, respectively. It was revealed the angle of the domain wall orientation in canted field does not depend on the value of field angle.
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