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APS » Journals » Phys. Rev. B » Volume 63 » Issue 17
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Phys. Rev. B 63, 174422 (2001) [4 pages]

Exchange coupling in epitaxial CoO/NiFe bilayers with compensated and uncompensated interfacial spin structures

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N. J. Gökemeijer
Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218

R. L. Penn and D. R. Veblen
Department of Earth and Planetary Sciences, The Johns Hopkins University, Baltimore, Maryland 21218

C. L. Chien
Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218

Received 7 November 2000; published 9 April 2001

An uncompensated antiferromagnetic surface of CoO is essential for the establishment of exchange bias. Exchange coupling for compensated surfaces is manifested by a large coercivity but no exchange bias field. Degradation of a compensated surface leads to an exchange bias field. These results clarify a key outstanding issue in exchange bias.

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.63.174422
DOI:
10.1103/PhysRevB.63.174422
PACS:
75.70.Cn, 75.30.Gw
 
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