Abstract
AbstractMagnetite nanoparticles are infiltrated into porous silicon leading to an accumulation of the particles within the pores. The minimum distance between the Fe3O4‐particles is given by the coating of the particles which is in the range of a few nanometers. Due to the coating exchange coupling between the particles is excluded, whereas dipolar coupling can take place. The distance between the pores is about 45 nm which assures that the magnetic particle‐particle interaction within individual pores is stronger than between particles of adjacent pores. Thus the morphology of the porous silicon matrix influences the magnetic behaviour of the composite. Furthermore the transition between ferromagnetic behaviour (low temperatures) and superparamagnetic behaviour (higher temperatures) of the specimens is figured out by investigating samples with two different sizes of infiltrated Fe3O4 nanoparticles. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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