  Experimental studies of anomalous Hall effect are performed for thin filmed
Ta/TbFeCo in a wide range of temperatures and magnetic fields up to 3 T. While
far from the compensation temperature (TM=277 K) the field dependence has a
conventional shape of a single hysteresis loop, just below the compensation
point the dependence is anomalous having the shape of a triple hysteresis. To
understand this behavior, we experimentally reveal the magnetic phase diagram
and theoretically analyze it in terms of spin-reorientation phase transitions.
We show that one should expect anomalous hysteresis loops below the
compensation point if in the vicinity of it the magnetic anisotropy is
dominated by FeCo sublattice due to interaction with Ta.
