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Physical Review B
(Condensed Matter and Materials Physics -1(I))

Phys. Rev. B 67, 172405 (2003) (4 pages)


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      Onset of exchange bias in ultrathin antiferromagnetic layers

    M. Ali, C. H. Marrows, and B. J. Hickey Department of Physics and
    Astronomy, E. C. Stoner Laboratory, University of Leeds, Leeds LS2
9JT, United Kingdom

(Received 4 November 2002; published 16 May 2003)

Current theoretical explanations of exchange biasing are based upon
magnetic domains in the antiferromagnetic layer being responsible for
the phenomenon. Both the ideas of planar and perpendicular domain walls
have been developed in explaining the various observed effects. Here the
exchange bias (Hex) has been investigated as a function of the
antiferromagnetic (AF) layer thickness (tAF) in IrMn/Co and FeMn/Co
exchange biased systems. The results indicate that the onset of biasing
occurs for tAF which appears to be far too low (~10 Å) to accommodate
planar domain walls (~200 Å) within the AF layer. From these results it
is inferred that planar domain walls cannot therefore be responsible for
biasing, and that theoretical calculations involving perpendicular
domain walls in the antiferromagnetic layers appear to be the more
plausible explanation. ©2003 The American Physical Society

URL: http://link.aps.org/abstract/PRB/v67/e172405
doi: <http://ojps.aip.org/jhtml/doi.jsp>10.1103/PhysRevB.67.172405
PACS: 75.70.Cn, 75.60.Ch        Additional Information
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