  Energy-loss magnetic chiral dichroism (EMCD) allows for the quantification of
magnetic properties of materials at the nanometer scale. It is shown that with
the support of simulations that help to identify the optimal conditions for a
successful experiment and upon implementing measurement routines that
effectively reduce the noise floor, EMCD measurements can be pushed towards
quantitative magnetic measurements even on individual nanoparticles. With this
approach, the ratio of orbital to spin magnetic moments for the Fe atoms in a
single L$1_0$ ordered FePt nanoparticle is determined to be ${m_l}/{m_s} = 0.08
\pm 0.02$. This finding is in good quantitative agreement with the results of
XMCD ensemble measurements.
