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Keywords
(6)
Exchange Bias
Hysteresis Loop
Magnetic Properties
Magnetization Reversal
Surface Morphology
Three Dimensional
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3D magnetization profile and multi-axes exchange bias in Co antidot arrays
3D magnetization profile and multi-axes exchange bias in Co antidot arrays,F. Fettar,L. Cagnon,N. Rougemaille
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3D magnetization profile and multi-axes exchange bias in Co antidot arrays
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F. Fettar
,
L. Cagnon
,
N. Rougemaille
Cu/Co/Cu trilayers have been deposited on nanoporous alumina membranes.
Magnetic properties
of the resulting Co antidot arrays are investigated using SQUID magnetometry. Hysteresis loops of these arrays show two-step magnetization reversal. In addition,
exchange bias
is observed, whether the cooling field is applied within or perpendicular to the surface plane. In the former case, the
exchange bias
changes sign close to the blocking temperature, and becomes positive. We attribute these effects to the local, crescent shape of the Co films, induced by the
surface morphology
of the alumina membranes. This morphology leads to a three-dimensional magnetization distribution at the nanoscale.
Published in 2010.
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