Abstract
We investigate the magnetoresistance (MR) effect and magnetic properties in (Co/Pt)4/Co/IrMn (SFM) and (Co/Pt)4/Co/IrMn/(Co/Pt)2/Co (DFM) structures with (Co/Pt)4/Co and (Co/Pt)2/Co multilayers having a perpendicular magnetic anisotropy. Despite the exchange bias field, the antiferromagnetic IrMn layer itself influences the coercivity (Hc) and MR differently for both types of structures when the IrMn layer is thin. A suppressed Hc and an enhanced MR in the DFM samples are obtained compared with those in the SFM samples. The maximum MR reaches up to (0.6 ± 0.1)% when the IrMn thickness (tIrMn) of the DFM samples varies from 1.5 to ∼5 nm, but the MR value of the SFM samples remains (0.1 ± 0.05)% with the same tIrMn range. The suppressed Hc and the enhanced MR in the DFM samples may be due to the formation of an antiferromagnetic-type contact when large antiferromagnetic domains in the IrMn layer are sandwiched by (Co/Pt)4/Co and (Co/Pt)2/Co multilayers.
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