Evidence of Exchange-Bias-Like Phenomenon in GdFe/TbFe/GdFe Domain Wall Junctions

An exchange-bias-like phenomenon has been observed in amorphous GdFe/TbFe/GdFe trilayers called domain wall junctions. They show classical ferromagnetic/antiferromagnetic behavior, and particularly, a characteristic hysteresis loop shift. The bias-like field is attributed to the occurrence of domain walls (DWs) at the interface which can be compressed or decompressed by the external field. We show convincing evidence of these DWs from ac-susceptibility measurements. An evaluation of the bias field is proposed.