Abstract
It has recently been found that the exchange bias of a MnIr/CoFe system can be increasedsignificantly by adding a thermal treatment to the bilayer. To reveal the origin of thehigher exchange bias, we performed polarized neutron reflectivity measurements at theJRR-3 neutron source. The magnetization vector near the MnIr/CoFe interface forthermally treated samples differed from that for samples without the treatment. Wepropose a model in which the pinned spin area at the interface is extended due to theincreased roughness and atomic interdiffusion that result from the thermal treatment.
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