  Structural and ferromagnetic properties in Mn implanted, p-type Si were
investigated. High resolution structural analysis techniques like synchrotron
X-ray diffraction revealed the formation of MnSi1.7 nanoparticles already in
the as implanted samples. Depending on the Mn-fluence, the size increases from
5 nm to 20 nm upon rapid thermal annealing. No significant evidence is found
for Mn substituting Si sites either in the as-implanted or annealed samples.
The observed ferromagnetism yields a saturation moment of 0.21 mu_B per
implanted Mn at 10 K, which could be assigned to MnSi1.7 nanoparticles as
revealed by a temperature dependent magnetization measurement.
