Table 1.

Growth parameters used for the cobalt nanospheres in the present study. In the last column, the cobalt content (atomic percent) of a cobalt nanosphere of 400 nm in diameter grown under the reported conditions is given with the measurement precision in parentheses.

Φ, Nanosphere diameter (nm)	Vbeam (kV)	Ibeam (nA)	Co atom % (for Φ = 400 nm)
Φ < 150 nm	5.0	0.4	93 (2)
Φ ≥ 150 nm	5.0	1.6	91 (2)