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The effect of the saturation field on the magnetization reversal ofFePt(L10)/FeCo/CoO/FeCo multilayer (ML) has been investigated to understand theorigin of asymmetric magnetization reversal and its correlation with exchangebias (EB). In the ML structure, the bottom FeCo layer is coupled to the hardFePt(L10) layer, and the top FeCo layer is comparatively free due to therelatively more distance from it. The ML has been deposited under UHVconditions and characterized at each stage of growth using magneto-optical Kerreffect and x-ray reflectivity techniques. Magnetization reversal is furtherstudied through domain imaging using the Kerr microscopy technique. Theexperimental findings reveal that ML exhibits asymmetrical magnetizationreversal for a certain range of azimuthal angles for both 1.5kOe and 50kOesaturation fields; however, this angular range of asymmetry decreases with theincrease in the saturation field. Furthermore, EB was absent at the lowsaturation field, whereas, EB, in addition to asymmetry, is observed at thelarge saturation field. The origin of asymmetry is attributed tonon-collinearity between magnetic anisotropy axes of both FeCo layers. Itresults from the proximity effect through short-range Heisenberg exchangeinteraction via the CoO barrier layer. On the other hand, EB arises due tounidirectional anisotropy induced in the FePt layer due to the high saturationfield. It is further proposed that asymmetry would disappear whenunidirectional anisotropy is strong enough to align both the FeCo layers in thesaturation direction leading to loss of the non-collinearity between them.

Study of Asymmetric Magnetization Reversal and Exchange Bias in FePt(L10)/FeCo/CoO/FeCo Magnetic Multilayer