Exchange coupling has been observed in a ferromagnet (FM)/antiferromagnet (AF) bilayer with Curie temperature (TC)N\'eel temperature (TN) in the regime of T<TN, even when the FM layer is in the paramagnetic state. The exchange field HE and coercivity HC of the coupled bilayer show completely different temperature dependence from conventional FM/AF bilayers with TC>TN. With increasing temperature, HC vanishes at TC, whereas HE persists to TN. The results show that the exchange coupling can be established in FM/AF bilayers regardless of the relative values of TC and TN.
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Cai et al. (1999) studied this question.
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