The classical solid-phase reaction between Fe 2 O 3 and Al layers in thin films is initiated. It is shown that, in the reaction products, Fe granulated films are formed in the Al 2 O 3 nonconducting matrix. Analysis of the reaction equation demonstrates that the volume fraction of iron in the granulated films is less than the percolation threshold. This determines the magnetic properties of iron clusters in a superparamagnetic state. It is assumed that the nanocrystalline microstructure exists in thin films after solid-phase reactions proceeding under conditions of self-propagating high-temperature synthesis.
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Myagkov et al. (2003) studied this question.
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