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                     Phys. Rev. B 57, R8111-R8114 (1998)

                         [Issue 14 - 1 April 1998 ]

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Asymmetry of domain nucleation and enhanced coercivity in exchange-biased
epitaxial NiO/NiFe bilayers

     V. I. Nikitenko, V. S. Gornakov, L. M. Dedukh, Yu. P. Kabanov, and A.
     F. Khapikov
     Institute of Solid State Physics, Russian Academy of Sciences,
     142432 Chernogolovka, Moscow District, Russia

     A. J. Shapiro and R. D. Shull
     Metallurgy Division, National Institute of Standards and Technology,
     Gaithersburg, Maryland 20899

     A. Chaiken and R. P. Michel
     Materials Science and Technology Division, Lawrence Livermore National
     Laboratory, Livermore, California 94551

Received 14 January 1998

Magnetization reversal processes in epitaxial NiO/NiFe bilayers were studied
using the magneto-optic indicator film technique. The influence of
dislocations on these processes was determined. Remagnetization parallel to
the unidirectional anisotropy axis proceeds by domain nucleation and growth,
with nucleation center activity being asymmetric with respect to the applied
field sign. Magnetization reversal in the hard axis direction occurs by
incoherent rotation. The enhanced coercivity and asymmetric nucleation can
be explained by taking into account domain wall behavior in the
antiferromagnetic layer.

©1998 The American Physical Society

URL: http://link.aps.org/abstract/PRB/v57/pR8111
DOI: 10.1103/PhysRevB.57.R8111
PACS: 75.70.Cn, 75.30.Et, 75.50.-y, 75.60.-d
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