Phys. Rev. Lett. 81, 2795–2798 (1998)Exchange Coupling in Ferromagnet/Antiferromagnet Bilayers with Comparable TC and TNReceived 15 April 1998; published in the issue dated 28 September 1998 Exchange coupling has been observed in FM/AF bilayers with TC close to, and less than, TN. The exchange field HE and coercivity Hc show an unusual temperature dependence due to the 1/MF dependence and the influence of the FM ordering by the AF layer at T>TC. The exchange coupling energy vanishes at TN, whereas the intrinsic Hc vanishes at TC. The FM/AF exchange coupling preserves some degree of ordering in the FM layer even at T>TC. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.81.2795
DOI:
10.1103/PhysRevLett.81.2795
PACS:
75.70.Cn, 75.30.Et, 75.50.Kj
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