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Ge substrates of (1 0 0) orientation were irradiated with 100 keV Mn ions (2 × 1016 at./cm2) at a temperature of 190 °C. Pronounced swelling of the irradiated material up to 150 nm, associated with the formation of a Mn-doped amorphous porous Ge layer, is investigated by scanning electron microscopy and X-ray photoelectron depth profiling. Magneto-optical Kerr effect hysteresis loops have been used to characterize the magnetic properties of the obtained sample. The details of the hysteresis loops reveal that the ferromagnetic property of the sample up to ∼20 K and the subsequent strong non-linear paramagnetic response must be ascribed to Mn atoms dispersed in the amorphous porous implanted layer.
Publication date: 
1 Apr 2007

M Passacantando, L Ottaviano, V Grossi, A Verna, F D’Orazio, F Lucari, G Impellizzeri, F Priolo

Biblio References: 
Volume: 257 Issue: 1-2 Pages: 365-368
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms