Phys. Rev. B 60, 72–75 (1999)Exchange coupling in the paramagnetic stateReceived 2 February 1999; published in the issue dated 1 July 1999 Exchange coupling has been observed in a ferromagnet (FM)/antiferromagnet (AF) bilayer with Curie temperature (TC)≪Néel 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. © 1999 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.60.72
DOI:
10.1103/PhysRevB.60.72
PACS:
75.70.Cn, 75.30.Et, 75.50.Kj
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