Abstract
Previous magnetization and ferromagnetic resonance measurements showed that when coupling was observed between ferromagnetic layers separated by an antiferromagnetic NiO layer, it was always ferromagnetic. Here we report magnetization measurements that explain this result. We find that the coupling is only strongly ferromagnetic when the sample is cooled with the two ferromagnetic layer magnetizations parallel. Cooling with the magnetizations antiparallel causes the coupling to become nearly zero. Thus, the coupling retains a memory of the relative orientation of the ferromagnetic layer magnetizations during cooling.
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