(a) A typical TEM image showing several vertically aligned MnGe nanodots. (b) The HRTEM images of the MnGe nanodots (the selected area in (a)) showing a perfect diamond structure as the Ge matrix. (c, d) Bragg filtering of ±(111) (c) and ± (d) reflections, respectively, where no dislocation or distortion was observed. The dark contrast of the nanodots indicates the existence of significant strain.
