ENHANCEMENT OF EXCHANGE BIAS IN NiFe/IrM, IrMn/NiFe AND NiFe/IrMn/NiFe STRUCTURES WITH DIFFERENT THICKNESS OF ANTIFERROMAGNETIC LAYER

摘要

The influence of the sequence of the ferromagnetic (FM) and antiferromagnetic (AF) layers and the thickness of the antiferromagnetic layer on magnetic properties of FM/AF, AF/FM and FM/AF/FM structures was studied. Angular dependences of coercive force and exchange bias field were analyzed for all the structures with different thickness of the AF layer. For the AF/FM structures, the exchange bias field increases with an increase of the AF-layer thickness while no AF-layer-thickness dependence of magnetic properties was observed for the FM/AF and FM/AF/FM structures. The enhancement of the exchange bias was also found for the three-layered system.