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Materials 2011, 4(5), 908-928; doi:10.3390/ma4050908

Magnetic Nanoparticles Embedded in a Silicon Matrix

*  and
Institute of Physics, Karl Franzens University Graz, Universitaetsplatz 5, A-8010 Graz, Austria
* Author to whom correspondence should be addressed.
Received: 13 April 2011 / Accepted: 12 May 2011 / Published: 17 May 2011
(This article belongs to the Special Issue Porous Materials 2011)
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This paper represents a short overview of nanocomposites consisting of magnetic nanoparticles incorporated into the pores of a porous silicon matrix by two different methods. On the one hand, nickel is electrochemically deposited whereas the nanoparticles are precipitated on the pore walls. The size of these particles is between 2 and 6 nm. These particles cover the pore walls and form a tube-like arrangement. On the other hand, rather well monodispersed iron oxide nanoparticles, of 5 and 8 nm respectively, are infiltrated into the pores. From their size the particles would be superparamagnetic if isolated but due to magnetic interactions between them, ordering of magnetic moments occurs below a blocking temperature and thus the composite system displays a ferromagnetic behavior. This transition temperature of the nanocomposite can be varied by changing the filling factor of the particles within the pores. Thus samples with magnetic properties which are variable in a broad range can be achieved, which renders this composite system interesting not only for basic research but also for applications, especially because of the silicon base material which makes it possible for today’s process technology.
Keywords: porous silicon; magnetic nanoparticles; nanocomposite porous silicon; magnetic nanoparticles; nanocomposite
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Granitzer, P.; Rumpf, K. Magnetic Nanoparticles Embedded in a Silicon Matrix. Materials 2011, 4, 908-928.

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