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Phys. Rev. Lett. 96, 117204 (2006) [4 pages]

Enhancing Exchange Bias with Diluted Antiferromagnets

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Jung-Il Hong1, Titus Leo2, David J. Smith2, and Ami E. Berkowitz1,3
1Center for Magnetic Recording Research, University of California–San Diego, La Jolla, California 92093, USA
2Department of Physics and Astronomy and Center for Solid State Science, Arizona State University, Tempe, Arizona 85287, USA
3Department of Physics, University of California–San Diego, La Jolla, California 92093, USA

Received 3 September 2005; published 21 March 2006

The exchange bias HE of coupled polycrystalline films of antiferromagnetic CoO and ferromagnetic Co was significantly enhanced by the systematic substitution of nonmagnetic Mg for Co in CoO. Samples in which either Co or Co1-xMgxO were deposited first were investigated at temperatures from 10 to 300 K. With Co1-xMgxO on the bottom, the increased interfacial uncompensated spin density of the single antiferromagnetic domain Co1-xMgxO crystallites produced the enhanced HE. With Co on the bottom, a thin interfacial oxide layer was primarily responsible for the strongly increased HE.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.96.117204
DOI:
10.1103/PhysRevLett.96.117204
PACS:
75.30.Et, 71.70.Gm, 74.25.Ha, 75.50.Ee
 
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