Figure 4.

Temperature-dependent magnetization of magnetite-filled porous silicon, whereas the porous silicon matrices exhibit different morphologies. The particle size used was 8 nm in diameter. The lower blocking temperature (TB ~ 130 K) results from nanoparticles within pores with an average diameter of 50 nm and a concomitant mean pore distance of 60 nm. The higher TB ~ 160 K has been measured on a sample with pore diameters of about 90 nm and pore distances of about 35 nm.

Rumpf et al. Nanoscale Research Letters 2012 7:445   doi:10.1186/1556-276X-7-445
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