Asymmetric magnetization reversal and its dual origin in Co/FeMn out-of-plane induced exchanged bias systems

摘要

Comprehension of the origins of asymmetric behavior during the magnetization reversal is an outstanding issue in the studies of exchange bias (EB). By far, two intrinsic origins of the asymmetric magnetization reversal behavior (AMRB) have been found in different systems separately. The compatibility of the two origins has not been proved—yet. Here, we report on the AMRBs derived from cooperation between the two AMRB origins. Novel AMRBs, including the odd shape of the hysteresis loops and a positive EB, were found in the Co/FeMn bilayers grown under a perpendicular magnetic field. The striking AMRBs we observed could be explained by a model based on spin incoherent rotation and antiferromagnetic interfacial coupling. It suggests that the two AMRB origins are indispensable in the development of these unique AMRBs.