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Abstract:
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Due to exchange interactions across interfaces, the finite temperature intrinsic magnetic properties
(magnetisation, anisotropy) of nanostructured systems differ from those which would be observed in the
absence of coupling. These properties are calculated within a simple molecular field approach for classical
moment two-component systems, each component being characterised by the value of its Curie temperature,
TC, i.e., the strength of exchange. Magnetisation and anisotropy are influenced over a few (??5-10)
interatomic distances. Close to the Curie temperature of the lower-TC ferromagnet the influence is very
significant (typically 20-50% for magnetisation and 2-20% for anisotropy). The model is extended to
systems in which rare earth (R) - transition metal (T) compounds are coupled to Fe or Co. Analysis of the
results suggests that the change of intrinsic magnetic properties through interface exchange coupling will not
induce a significant coercivity. |